Common Sim Bus Interfaces

All GUNNS link classes have many variables, and Sim Bus can read & write to almost all of them. Which ones do you use? The links are designed to interface with other classes in specific ways, but we sometimes find other ways to interface them that the designers didn’t foresee. It’s not always obvious which terms to interface via the Sim Bus. This page is an attempt to detail the most important interfaces, but we can’t detail them all. So in addition to this guide, here are some tips for determining the link variables to use on your own:

Refer to the link class declarations in the source code (*.hh files):
- All links source code is either in gunns/core/ or gunns/aspects/.
Sometimes the Trick comments in the variable declaration will indicate that it is meant as a Sim Bus input or output.
Aspect diagrams will typically not spell out the actual variable names to interface, but will give a clue as to the type of parameter you are looking for, such as a temperature or a flow rate, etc., which you can then look for in the link class’ attributes.
See the big table below.

The main purpose of the ICD.txt file examples below is to show you which link variables to use for specific interfaces. Pay attention to the suffix variables in the SIM_VAR_NAME column, i.e. thermal.capacitor. mTemperature — these are the variables you are looking for. The other columns just give example names.

Fluid-Thermal Wall Heat Flux Interface

This is a common interface where a fluid aspect calculates a heat flux transferred from the fluid to the wall based on a wall temperature from the thermal aspect. The fluid aspect sends a heat flux Q to the thermal aspect, and receives a wall temperature T from the same thermal aspect. The thermal aspect is usually a GunnsThermalCapacitor link, and the fluid aspect is usually a GunnsFluidTank or most conductor link that do wall convection, such as a GunnsFluidValve, GunnsFluidFan, GunnsFluidPipe, etc.

The thermal capacitor’s mExternalHeatFlux term is actually an array to receive up to 15 heat fluxes from various sources. You would typically send one heat flux to array position ⁰, the next to ¹, and so on as needed.

…for Tanks:

There is an aspect diagram of this configuration in the GunnsDraw link help page for the GunnsFluidTank. We are talking about the first pattern shown for that link, where the fluid tank calculates Q. Here is what the ICD.txt file would contain for an example case:

PUI   SYS  BUS  SUBSYS  VAR_NAME  ACTION  RATE  SIM_OBJECT           SIM_VAR_NAME                            TYPE    UNITS  COMMENTS

# Exchange wall temperature and heat flux between a thermal capacitor & fluid tank:
# 
# Wall temperature from thermal to fluid aspect:
xxxx  sys  bus  subsys  wallT     WRITE   rate  SimObject simObject  thermal.capacitor.mTemperature          double  (K)    Wall temperature
xxxx  sys  bus  subsys  wallT     READ    rate  SimObject simObject  fluid.tank.mShellTemperature            double  (K)    Wall temperature

# Wall heat flux from fluid to thermal aspect:
xxxx  sys  bus  subsys  wallQ     WRITE   rate  SimObject simObject  fluid.tank.mHeatFluxToShell             double  (W)    Wall heat flux
xxxx  sys  bus  subsys  wallQ     READ    rate  SimObject simObject  thermal.capacitor.mExternalHeatFlux[0]  double  (W)    Wall heat flux

…for Pipes, Valves & Pump/Fans:

For the fluid conductors GunnsFluidPipe, GunnsFluidValve, GunnsGasFan and their derived classes, the pattern is the same except for different variable names in the fluid link:

PUI   SYS  BUS  SUBSYS  VAR_NAME  ACTION  RATE  SIM_OBJECT           SIM_VAR_NAME                            TYPE    UNITS  COMMENTS

# Exchange wall temperature and heat flux between a thermal capacitor & fluid conductor:
# 
# Wall temperature from thermal to fluid aspect:
xxxx  sys  bus  subsys  wallT     WRITE   rate  SimObject simObject  thermal.capacitor.mTemperature          double  (K)    Wall temperature
xxxx  sys  bus  subsys  wallT     READ    rate  SimObject simObject  fluid.conductor.mWallTemperature        double  (K)    Wall temperature

# Wall heat flux from fluid to thermal aspect:
xxxx  sys  bus  subsys  wallQ     WRITE   rate  SimObject simObject  fluid.conductor.mWallHeatFlux           double  (W)    Wall heat flux
xxxx  sys  bus  subsys  wallQ     READ    rate  SimObject simObject  thermal.capacitor.mExternalHeatFlux[0]  double  (W)    Wall heat flux

…for Heat Exchangers:

The GunnsFluidHeatExchanger link can have 1 or more segments, and each can have its own Q/T exchange with a separate thermal asepct. See Example 3 in the “Typical HX Connections” diagram in the above link. A 4-segment counter-flow configuration is typical of this link, and we show the ICD for this configuration below. There are 8 separate Q/T exhanges created here, 4 for each of the 2 fluid loops. Like the tanks and other conductors, each segment has the same Sim Bus interface pattern, just with different target variables in the fluid link:

PUI   SYS  BUS  SUBSYS  VAR_NAME   ACTION  RATE  SIM_OBJECT           SIM_VAR_NAME                                  TYPE    UNITS  COMMENTS

# Exchange wall temperature and heat flux between thermal aspect and 2 fluid loops for a 4-segment counter-flow heat exchanger:
# 
# Temperature and heat fluxes for segment 0:
xxxx  sys  bus  subsys  seg0T      WRITE   rate  SimObject simObject  thermal.capacitorHxSeg0.mTemperature          double  (K)    Segment temperature
xxxx  sys  bus  subsys  seg0T      READ    rate  SimObject simObject  fluidCold.heatExchanger.mSegTemperature[0]    double  (K)    Segment temperature
xxxx  sys  bus  subsys  seg0T      READ    rate  SimObject simObject  fluidHot.heatExchanger.mSegTemperature[3]     double  (K)    Segment temperature
xxxx  sys  bus  subsys  seg0ColdQ  WRITE   rate  SimObject simObject  fluidCold.heatExchanger.mSegEnergyGain[0]     double  (W)    Segment heat flux
xxxx  sys  bus  subsys  seg0ColdQ  READ    rate  SimObject simObject  thermal.capacitorHxSeg0.mExternalHeatFlux[0]  double  (W)    Segment heat flux
xxxx  sys  bus  subsys  seg0HotQ   WRITE   rate  SimObject simObject  fluidHot.heatExchanger.mSegEnergyGain[3]      double  (W)    Segment heat flux
xxxx  sys  bus  subsys  seg0HotQ   READ    rate  SimObject simObject  thermal.capacitorHxSeg0.mExternalHeatFlux[1]  double  (W)    Segment heat flux

# Temperature and heat fluxes for segment 1:
xxxx  sys  bus  subsys  seg1T      WRITE   rate  SimObject simObject  thermal.capacitorHxSeg1.mTemperature          double  (K)    Segment temperature
xxxx  sys  bus  subsys  seg1T      READ    rate  SimObject simObject  fluidCold.heatExchanger.mSegTemperature[1]    double  (K)    Segment temperature
xxxx  sys  bus  subsys  seg1T      READ    rate  SimObject simObject  fluidHot.heatExchanger.mSegTemperature[2]     double  (K)    Segment temperature
xxxx  sys  bus  subsys  seg1ColdQ  WRITE   rate  SimObject simObject  fluidCold.heatExchanger.mSegEnergyGain[1]     double  (W)    Segment heat flux
xxxx  sys  bus  subsys  seg1ColdQ  READ    rate  SimObject simObject  thermal.capacitorHxSeg1.mExternalHeatFlux[0]  double  (W)    Segment heat flux
xxxx  sys  bus  subsys  seg1HotQ   WRITE   rate  SimObject simObject  fluidHot.heatExchanger.mSegEnergyGain[2]      double  (W)    Segment heat flux
xxxx  sys  bus  subsys  seg1HotQ   READ    rate  SimObject simObject  thermal.capacitorHxSeg1.mExternalHeatFlux[1]  double  (W)    Segment heat flux

# Temperature and heat fluxes for segment 2:
xxxx  sys  bus  subsys  seg2T      WRITE   rate  SimObject simObject  thermal.capacitorHxSeg2.mTemperature          double  (K)    Segment temperature
xxxx  sys  bus  subsys  seg2T      READ    rate  SimObject simObject  fluidCold.heatExchanger.mSegTemperature[2]    double  (K)    Segment temperature
xxxx  sys  bus  subsys  seg2T      READ    rate  SimObject simObject  fluidHot.heatExchanger.mSegTemperature[1]     double  (K)    Segment temperature
xxxx  sys  bus  subsys  seg2ColdQ  WRITE   rate  SimObject simObject  fluidCold.heatExchanger.mSegEnergyGain[2]     double  (W)    Segment heat flux
xxxx  sys  bus  subsys  seg2ColdQ  READ    rate  SimObject simObject  thermal.capacitorHxSeg2.mExternalHeatFlux[0]  double  (W)    Segment heat flux
xxxx  sys  bus  subsys  seg2HotQ   WRITE   rate  SimObject simObject  fluidHot.heatExchanger.mSegEnergyGain[1]      double  (W)    Segment heat flux
xxxx  sys  bus  subsys  seg2HotQ   READ    rate  SimObject simObject  thermal.capacitorHxSeg2.mExternalHeatFlux[1]  double  (W)    Segment heat flux

# Temperature and heat fluxes for segment 3:
xxxx  sys  bus  subsys  seg3T      WRITE   rate  SimObject simObject  thermal.capacitorHxSeg3.mTemperature          double  (K)    Segment temperature
xxxx  sys  bus  subsys  seg3T      READ    rate  SimObject simObject  fluidCold.heatExchanger.mSegTemperature[3]    double  (K)    Segment temperature
xxxx  sys  bus  subsys  seg3T      READ    rate  SimObject simObject  fluidHot.heatExchanger.mSegTemperature[0]     double  (K)    Segment temperature
xxxx  sys  bus  subsys  seg3ColdQ  WRITE   rate  SimObject simObject  fluidCold.heatExchanger.mSegEnergyGain[3]     double  (W)    Segment heat flux
xxxx  sys  bus  subsys  seg3ColdQ  READ    rate  SimObject simObject  thermal.capacitorHxSeg3.mExternalHeatFlux[0]  double  (W)    Segment heat flux
xxxx  sys  bus  subsys  seg3HotQ   WRITE   rate  SimObject simObject  fluidHot.heatExchanger.mSegEnergyGain[0]      double  (W)    Segment heat flux
xxxx  sys  bus  subsys  seg3HotQ   READ    rate  SimObject simObject  thermal.capacitorHxSeg3.mExternalHeatFlux[1]  double  (W)    Segment heat flux

Note how the mapping of reads & writes between the segments creates the counter-flow effect. By convention, the thermal aspect segment numbering matches the order of the “cold” fluid loop, and the “hot” fluid loop reverses its segment order to create the counter-flow effect, like so:

(cold fluid seg 0) <--T------Q--> (thermal seg 0) <--Q------T--> (hot fluid seg 3)
(cold fluid seg 1) <--T------Q--> (thermal seg 1) <--Q------T--> (hot fluid seg 2)
(cold fluid seg 2) <--T------Q--> (thermal seg 2) <--Q------T--> (hot fluid seg 1)
(cold fluid seg 3) <--T------Q--> (thermal seg 3) <--Q------T--> (hot fluid seg 0)

Supply/Demand Network Interface

…between Basic Networks:

GunnsBasicExternalDemand and GunnsBasicExternalSupply are typically paired across the Sim Bus to create a flow interface between two Basic (thermal or electrical) networks. See the aspect diagram in the above links.

A node potential value is sent from the Supply link to the Demand link, and a demand flux value is sent back, like so:

PUI   SYS  BUS  SUBSYS  VAR_NAME  ACTION  RATE  SIM_OBJECT           SIM_VAR_NAME                            TYPE    UNITS  COMMENTS

# Exchange Supply/Demand between two thermal networks:
# 
# Supply temperature from "supply" to "demand" network:
xxxx  sys  bus  subsys  supplyT   WRITE   rate  SimObject simObject  thermal_1.to2Supply.mSupplyPotential    double  (K)    Supply temperature
xxxx  sys  bus  subsys  supplyT   READ    rate  SimObject simObject  thermal_2.from1Demand.mSupplyPotential  double  (K)    Supply temperature

# Demand flux from "demand" to "supply" network:
xxxx  sys  bus  subsys  demandQ   WRITE   rate  SimObject simObject  thermal_2.from1Demand.mDemandFlux       double  (W)    Demand flux
xxxx  sys  bus  subsys  demandQ   READ    rate  SimObject simObject  thermal_1.to2Supply.mDemandFlux         double  (W)    Demand flux

…between Fluid Networks:

The GunnsFluidExternalSupply and GunnsFluidExternalDemand interface works the same as the Basic Supply & Demand interface, just with more data describing the fluid properties flowing between the networks.

PUI   SYS  BUS  SUBSYS  VAR_NAME      ACTION  RATE  SIM_OBJECT           SIM_VAR_NAME                                   TYPE    UNITS         COMMENTS

# Exchange Supply/Demand between two thermal networks:
# 
# Supply fluid data from "supply" to "demand" network:
xxxx  sys  bus  subsys  supplyP       WRITE   rate  SimObject simObject  fluid_1.to2Supply.mSupplyPressure              double  (kPa)         Supply pressure
xxxx  sys  bus  subsys  supplyT       WRITE   rate  SimObject simObject  fluid_1.to2Supply.mSupplyTemperature           double  (K)           Supply temperature
xxxx  sys  bus  subsys  supplyX[0-5]  WRITE   rate  SimObject simObject  fluid_1.to2Supply.mSupplyMassFractions[0-5]    double  (--)          Supply mass fractions
xxxx  sys  bus  subsys  supplyC       WRITE   rate  SimObject simObject  fluid_1.to2Supply.mSupplyCapacitance           double  (kg*mol/kPa)  Supply capacitance
xxxx  sys  bus  subsys  supplyP       READ    rate  SimObject simObject  fluid_2.from1Demand.mSupplyPressure            double  (kPa)         Supply pressure
xxxx  sys  bus  subsys  supplyT       READ    rate  SimObject simObject  fluid_2.from1Demand.mSupplyTemperature         double  (K)           Supply temperature
xxxx  sys  bus  subsys  supplyX[0-5]  READ    rate  SimObject simObject  fluid_2.from1Demand.mSupplyMassFractions[0-5]  double  (--)          Supply mass fractions
xxxx  sys  bus  subsys  supplyC       READ    rate  SimObject simObject  fluid_2.from1Demand.mSupplyCapacitance         double  (kg*mol/kPa)  Supply capacitance

# Demand fluid data from "demand" to "supply" network:
xxxx  sys  bus  subsys  demandF       WRITE   rate  SimObject simObject  fluid_2.from1Demand.mDemandFlux                double  (kg*mol/s)    Demand flux
xxxx  sys  bus  subsys  demandT       WRITE   rate  SimObject simObject  fluid_2.from1Demand.mDemandTemperature         double  (K)           Demand temperature
xxxx  sys  bus  subsys  demandX[0-1]  WRITE   rate  SimObject simObject  fluid_2.from1Demand.mDemandMassFractions[0-1]  double  (--)          Demand mass fractions
xxxx  sys  bus  subsys  demandF       READ    rate  SimObject simObject  fluid_1.to2Supply.mDemandFlux                  double  (kg*mol/s)    Demand flux
xxxx  sys  bus  subsys  demandT       READ    rate  SimObject simObject  fluid_1.to2Supply.mDemandTemperature           double  (K)           Demand temperature
xxxx  sys  bus  subsys  demandX[0-1]  READ    rate  SimObject simObject  fluid_1.to2Supply.mDemandMassFractions[0-1]    double  (--)          Demand mass fractions

A couple of notes:

The mSupplyCapacitance is optional. See the link help pages for how to use these links.
Note the array range notation on the Mass Fraction terms. This is how Sim Bus transfers arrays of primitives. In this example, the “supply” network has 6 fluid constituents, so its mass fractions array is sized 6, or [0-5] in Sim Bus syntax. Likewise, in this example the “demand” network has 2 fluid constituents, or [0-1].

Signal-Fluid Valve Control Interface

Most GunnsFluidValve and derived links have a mPosition term that can be commanded by some kind of controller model via the Sim Bus. These controllers are what we typically call a “Signal aspect”, and may model all kinds of valve actuators like solenoids, motor-driven valves, manual valves, etc. Their interface with the fluid aspect is always the same: give us a mPosition from 0 (full closed) to 1 (full open), like so:

PUI   SYS  BUS  SUBSYS  VAR_NAME  ACTION  RATE  SIM_OBJECT           SIM_VAR_NAME                           TYPE    UNITS  COMMENTS

# Send valve position from Signal aspect to fluid network:
xxxx  sys  bus  subsys  position  WRITE   rate  SimObject simObject  signal.valveController.mFluidPosition  double  (--)   Valve position
xxxx  sys  bus  subsys  position  READ    rate  SimObject simObject  fluid.valve.mPosition                  double  (--)   Valve position

Signal-Fluid Pump Control Interface

All fluid “impeller” links, such as GunnsGasFan, GunnsGasDisplacementPump, GunnsLiquidCentrifugalPump, and GunnsLiquidDisplacementPump have a similar interface with a pump/fan motor/controller model. The motor model sends a rotational speed to the fluid aspect, and the fluid aspect sends back a resistance torque to the motor. This creates a closed-loop dynamic model. See here for an aspect diagram of a pump/fan — we are talking about its Signal/Fluid interface.

PUI   SYS  BUS  SUBSYS  VAR_NAME  ACTION  RATE  SIM_OBJECT           SIM_VAR_NAME                  TYPE    UNITS      COMMENTS

# Exchange shaft speed & torque for a pump motor/fluid interface:
# 
# Motor shaft speed to the fluid impeller:
xxxx  sys  bus  subsys  speed     WRITE   rate  SimObject simObject  signal.motor.mMotorSpeed      double  (rev/min)  Pump motor shaft speed
xxxx  sys  bus  subsys  speed     READ    rate  SimObject simObject  fluid.pump.mMotorSpeed        double  (rev/min)  Pump motor shaft speed

# Fluid load torque to the motor:
xxxx  sys  bus  subsys  torque    WRITE   rate  SimObject simObject  fluid.pump.mImpellerTorque    double  (N*m)      Pump fluid shaft torque
xxxx  sys  bus  subsys  torque    READ    rate  SimObject simObject  signal.motor.mLoadTorques[0]  double  (N*m)      Pump fluid shaft torque

TBD

…and many more…

Big Table of Suggested Link Sim Bus Terms

These are just suggestions: look at the class declarations for more hints & info about how & when to use what terms.

In general, base class attributes are also suggestions. For instance, GunnsBasicPotential extends GunnsBasicConductor, so mDefaultConductivity is a possible input to GunnsBasicPotential.

Basic Links

Link	Extends	Inputs	Outputs
GunnsBasicCapacitor	GunnsBasicLink	—	—
GunnsBasicConductor	GunnsBasicLink	mDefaultConductivity	—
GunnsBasicExternalDemand	GunnsBasicPotential	mSupplyPotential	mDemandFlux
GunnsBasicExternalSupply	GunnsBasicSource	mDemandFlux	mSupplyPotential
GunnsBasicJumper	GunnsBasicConductor	mPlug ⁰.mDirectConnectionRequest	—
GunnsBasicJumper	GunnsBasicConductor	mPlug ¹.mDirectConnectionRequest	—
GunnsBasicLink	—	—	mFlux
			mPotentialDrop
			mPower
GunnsBasicPotential	GunnsBasicConductor	mSourcePotential	—
GunnsBasicSocket	GunnsBasicConductor	—	—
GunnsBasicSource	GunnsBasicLink	mSourceFlux	—

Fluid Links

Link	Extends	Inputs	Outputs
GunnsFluid3WayValve	GunnsFluidLink	mPosition
		mPathA.mWallTemperature	mPathA.mWallHeatFlux
		mPathB.mWallTemperature	mPathB.mWallHeatFlux
GunnsFluidAccum	GunnsFluidLink	mLiquidHousingQ	mBellowsPosition
GunnsFluidAccum	GunnsFluidLink		mLiquidPressureReading
GunnsFluidAccumGas	GunnsFluidAccum	mGasHousingQ	mGasPressureReading
GunnsFluidAdsorber	GunnsFluidConductor	mWallTemperature	mWallHeatFlux
GunnsFluidCapacitor	GunnsFluidLink	—	—
GunnsFluidCheckValve	GunnsFluidValve	—	—
GunnsFluidCondensingHxSeparator	GunnsFluidConductor	mSegmentTemperature	mSegmentHeat
		mWsMotorSpeed	mTransferTemperature
		mTransferFlowRate	mTransferPressure
			mWsMotorTorque
			mLiquidOverflow
GunnsFluidConductor	GunnsFluidLink	mMaxConductivity	—
GunnsFluidEqConductor	GunnsFluidLink	mPort0DemandFlux	mPort0SupplyCapacitance
		mPort0DemandTemperature	mPort0SupplyPressure
			mPort0SupplyTemperature
			mPort0SupplyMassFractions
		mPort1DemandFlux	mPort1SupplyCapacitance
		mPort1DemandTemperature	mPort1SupplyPressure
			mPort1SupplyTemperature
			mPort1SupplyMassFractions
GunnsFluidExternalDemand	GunnsFluidPotential	mSupplyPressure	mDemandFlux
		mSupplyTemperature	mDemandTemperature
		mSupplyMassFractions	mDemandMassFractions
		mSupplyCapacitance
GunnsFluidExternalSupply	GunnsFluidSource	mDemandFlux	mSupplyPressure
		mDemandTemperature	mSupplyTemperature
		mDemandMassFractions	mSupplyMassFractions
			mSupplyCapacitance
GunnsFluidHatch	GunnsFluidValve	—	—
GunnsFluidHeater	GunnsFluidLink	mHeaterPower	mHeatFlux
GunnsFluidHeatExchanger	GunnsFluidConductor	mSegTemperature	mSegEnergyGain
GunnsFluidHotAdsorber	GunnsFluidAdsorber	—	—
GunnsFluidHotReactor	GunnsFluidReactor	—	—
GunnsFluidJumper	GunnsFluidConductor	mPlug ⁰.mDirectConnectionRequest	—
GunnsFluidJumper	GunnsFluidConductor	mPlug ¹.mDirectConnectionRequest	—
GunnsFluidLeak	GunnsFluidConductor	—	—
GunnsFluidLink	GunnsBasicLink	—	mFlowRate
GunnsFluidLink	GunnsBasicLink	—	mVolFlowRate
GunnsFluidLiquidWaterSensor	GunnsFluidConductor	—	mLiquidPresent
			mRelativeHumidity
			mDewPoint
			mSaturationPressure
GunnsFluidMetabolic	GunnsFluidSource	mNCrew	—
GunnsFluidPhaseChangeSource	GunnsFluidLink	mPowerInput	—
GunnsFluidPipe	GunnsFluidConductor	mWallTemperature	mWallHeatFlux
GunnsFluidPotential	GunnsFluidConductor	mSourcePressure	—
GunnsFluidPressureSensitiveValve	GunnsFluidLink	mWallTemperature	mWallHeatFlux
GunnsFluidReactor	GunnsFluidConductor	mWallTemperature	mWallHeatFlux
GunnsFluidRegulatorValve	GunnsFluidPressureSensitiveValve	—	—
GunnsFluidReliefValve	GunnsFluidPressureSensitiveValve	—	—
GunnsFluidSensor	GunnsFluidConductor	—	mTemperature
			mPressure
			mDeltaPressure
			mMassFlowRate
			mVolumetricFlowRate
			mPartialPressure
GunnsFluidSeparatorGas	GunnsFluidConductor	mSeparatorSpeed	mTransferTemperature
		mTransferFlowRate	mTransferPressure
			mLiquidOverflow
GunnsFluidSeparatorLiquid	GunnsFluidPotential	mTransferTemperature	—
GunnsFluidShadow	GunnsFluidPotential	mInputPressure	mOutputPressure
		mInputTemperature	mOutputTemperature
		mInputMixture	mOutputMixture
		mShadowActiveControl
GunnsFluidSimpleH2Redox	GunnsFluidLink	mCurrent	mOutputStackVoltage
GunnsFluidSimpleQd	GunnsFluidConductor	mState	mWallHeatFlux
GunnsFluidSimpleQd	GunnsFluidConductor	mWallTemperature
GunnsFluidSocket	GunnsFluidConductor	—	—
GunnsFluidSource	GunnsFluidLink	mFlowDemand	—
GunnsFluidSublimator	GunnsFluidLink	mHeatBalance	mThermalConductivity
GunnsFluidSublimator	GunnsFluidLink	mStructureTemperature
GunnsFuidTank	GunnsFluidCapacitor	mShellTemperature	mHeatFluxToShell
GunnsFuidTank	GunnsFluidCapacitor		mHeatFluxFromShell
GunnsFluidValve	GunnsFluidConductor	mPosition	mWallHeatFlux
GunnsFluidValve	GunnsFluidConductor	mWallTemperature
GunnsGasDisplacementPump	GunnsFluidSource	mMotorSpeed	mImpellerTorque
GunnsGasDisplacementPump	GunnsFluidSource	mWallTemperature	mWallHeatFlux
GunnsLiquidCentrifugalPump	GunnsGasFan	—	—
GunnsLiquidDisplacementPump	GunnsGasDisplacementPump	—	—
GunnsGasFan	GunnsFluidPotential	mWallTemperature	mWallHeatFlux
GunnsGasFan	GunnsFluidPotential	mMotorSpeed	mImpellerTorque

Thermal Links

Link	Extends	Inputs	Outputs
GunnsThermalCapacitor	GunnsBasicCapacitor	mExternalHeatFlux	mTemperature
GunnsThermalHeater	GunnsThermalSource	mPowerElectrical	—
GunnsThermalMultiPanel	GunnsThermalSource	mViewScalar	—
GunnsThermalMultiPanel	GunnsThermalSource	mIncidentFlux	—
GunnsThermalPanel	GunnsThermalSource	mIncidentHeatFluxPerArea	—
GunnsThermalPotential	GunnsBasicPotential	—	mHeatFluxIntoNode
GunnsThermalRadiation	GunnsBasicConductor	mViewScalar	—
GunnsThermalSource	GunnsBasicLink	mDemandedFlux	—

Electrical Links

Link	Extends	Inputs	Outputs
GunnsElectBattery	GunnsBasicPotential	—	mHeat
GunnsElectBattery	GunnsBasicPotential	—	mSoc
GunnsElectConverterInput	GunnsBasicLink	mEnabled	mTotalPowerLoss
		mResetTrips	mInputUnderVoltageTrip.mIsTripped
			mInputOverVoltageTrip.mIsTripped
GunnsElectConverterOutput	GunnsBasicLink	mEnabled	mTotalPowerLoss
		mSetpoint	mOutputOverVoltageTrip.mIsTripped
		mResetTrips	mOutputUnderVoltageTrip.mIsTripped
			mOutputOverCurrentTrip.mIsTripped
EpsConstantPowerLoad	GunnsBasicConductor	mDesiredPower	mPowerDraw
GunnsElectRealDiode	GunnsBasicPotential	—	—
GunnsElectricalResistor	GunnsBasicConductor	—	mWasteHeat
GunnsResistiveLoad	GunnsElectricalResistor	mLoadSwitch.mSwitchCommandedClosed	mPowerValid
GunnsElectIps	GunnsBasicLink	mCommandOnUsed	mHeatGenerated
GunnsElectIps	GunnsBasicLink	mCommandOn	mActivePowerSource
GunnsElectUserLoadSwitch	GunnsBasicConductor	mSwitch.mSwitchCommandedClosed	mSwitch.mPosTrip
GunnsElectUserLoadSwitch	GunnsBasicConductor	mSwitch.mTripReset	mSwitch.mNegTrip
GunnsElectUserLoadSwitch2	GunnsBasicConductor	mSwitch.mPositionCommand	mSwitch.mInputUnderVoltageTrip.mIsTripped
		mSwitch.mResetTripsCommand	mSwitch.mInputOverVoltageTrip.mIsTripped
			mSwitch.mPosOverCurrentTrip.mIsTripped
			mSwitch.mNegOverCurrentTrip.mIsTripped
SwitchElect	GunnsBasicConductor	mSwitch.mSwitchCommandedClosed	mPosTrip
SwitchElect	GunnsBasicConductor	mTripReset	mNegTrip
PowerBusElect	GunnsBasicLink	mLoad[#].mLoadOperMode	mLoad[#].mPowerValid
PowerBusElect	GunnsBasicLink	mPlug[ 0 ].mDirectConnectionRequest
GunnsElectPvArray	GunnsBasicLink	mSections[#].mInput.mSourceFluxMagnitude	mTerminal.mPower
		mSections[#].mInput.mSourceAngle
		mSections[#].mInput.mSourceExposedFraction
		mSections[#].mInput.mTemperature
GunnsElectPvRegShunt	GunnsBasicLink	mEnabled	mTrips.mInOverVoltage.mIsTripped
		mPowered	mTrips.mInOverCurrent.mIsTripped
		mVoltageSetpoint	mTrips.mOutOverVoltage.mIsTripped
		mResetTrips	mTrips.mOutOverCurrent.mIsTripped
			mTrips.mOutUnderVoltage.mIsTripped
GunnsElectPvRegConv	GunnsBasicLink	mEnabled	mTrips.mInOverVoltage.mIsTripped
		mPowered	mTrips.mInOverCurrent.mIsTripped
		mVoltageSetpoint	mTrips.mOutOverVoltage.mIsTripped
		mResetTrips	mTrips.mOutOverCurrent.mIsTripped
			mTrips.mOutUnderVoltage.mIsTripped

Common_Sim_Bus_Interfaces - nasa/gunns GitHub Wiki

Common Sim Bus Interfaces

Fluid-Thermal Wall Heat Flux Interface

…for Tanks:

…for Pipes, Valves & Pump/Fans:

…for Heat Exchangers:

Supply/Demand Network Interface

…between Basic Networks:

…between Fluid Networks:

Signal-Fluid Valve Control Interface

Signal-Fluid Pump Control Interface

TBD

Big Table of Suggested Link Sim Bus Terms

Basic Links

Fluid Links

Thermal Links

Electrical Links

⚠️ GitHub.com Fallback ⚠️

Common_Sim_Bus_Interfaces - nasa/gunns GitHub Wiki

Common Sim Bus Interfaces

Fluid-Thermal Wall Heat Flux Interface

…for Tanks:

…for Pipes, Valves & Pump/Fans:

…for Heat Exchangers:

Supply/Demand Network Interface

…between Basic Networks:

…between Fluid Networks:

Signal-Fluid Valve Control Interface

Signal-Fluid Pump Control Interface

TBD

Big Table of Suggested Link Sim Bus Terms

Basic Links

Fluid Links

Thermal Links

Electrical Links

⚠️ **GitHub.com Fallback** ⚠️

⚠️ GitHub.com Fallback ⚠️