preCICE Setup - sltmyr/precice GitHub Wiki

Setup of preCICE

preCICE is set up via a precice-config.xml file. It contains all the settings preCICE needs to run the coupled simulation. For example, we need to specify the participants of the simulation, and if the coupling should be done implicitly or explicitly. The configuration for the test case takes the following form:

<?xml version="1.0" encoding='UTF-8'?>

<precice-configuration>

   <solver-interface dimensions="3">
      <data:vector name="Forces0"/>
      <data:vector name="DisplacementDeltas0"/>

      <mesh name="SU2_Mesh0">
         <use-data name="Forces0"/>
         <use-data name="DisplacementDeltas0"/>
      </mesh>

      <mesh name="Calculix_Mesh">
         <use-data name="DisplacementDeltas0"/>
         <use-data name="Forces0"/>
      </mesh>

      <participant name="SU2_CFD">
         <use-mesh name="Calculix_Mesh" from="Calculix"/>
         <use-mesh name="SU2_Mesh0" provide="yes"/>
         <write-data name="Forces0" mesh="SU2_Mesh0"/>
         <read-data  name="DisplacementDeltas0" mesh="SU2_Mesh0"/>
         <mapping:nearest-neighbor
            direction="write" from="SU2_Mesh0" to="Calculix_Mesh"
            constraint="conservative" timing="initial"/>
         <mapping:nearest-neighbor
	        direction="read" from="Calculix_Mesh" to="SU2_Mesh0"
            constraint="consistent" timing="initial"/>
      </participant>

      <participant name="Calculix">
         <use-mesh name="Calculix_Mesh" provide="yes"/>
         <write-data name="DisplacementDeltas0" mesh="Calculix_Mesh"/>
         <read-data  name="Forces0"      mesh="Calculix_Mesh"/>
      </participant>

      <m2n:sockets from="SU2_CFD" to="Calculix"  exchange-directory="../" distribution-type="gather-scatter"/>
      
      <coupling-scheme:serial-implicit>
           <participants first="SU2_CFD" second="Calculix"/>
           <max-timesteps value="10000"/>
           <timestep-length value="1e-4" />
           <exchange data="Forces0" mesh="Calculix_Mesh" from="SU2_CFD" to="Calculix"/>
           <exchange data="DisplacementDeltas0" mesh="Calculix_Mesh" from="Calculix" to="SU2_CFD" />
           <max-iterations value="50"/>
           <relative-convergence-measure limit="1e-4" data="DisplacementDeltas0" mesh="Calculix_Mesh"/>
           <relative-convergence-measure limit="1e-4" data="Forces0" mesh="Calculix_Mesh"/>
           <extrapolation-order value="2"/>
           <post-processing:aitken>
              <data name="DisplacementDeltas0" mesh="Calculix_Mesh"/>
              <initial-relaxation value="0.1"/>
           </post-processing:aitken>
      </coupling-scheme:serial-implicit>

   </solver-interface>

</precice-configuration>
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