[Nektar-users] Hi all error ending my simulation

20 Mar 2019


      Hi All,
i am runing simple case at Re1000, i tried many meshs all of them give me
the same error

//////////////////////
Steps: 91200    Time: 424.694      CPU Time: 4.48716s
Steps: 91210    Time: 424.695      CPU Time: 4.62339s
CG iterations made = 5001 using tolerance of 1e-09 (error = nan, rhs_mag =
inf)
job ended at
/////////////////////////////
any suggestions?

my case file
///////////////////////////////////////////
<?xml version="1.0" encoding="UTF-8" ?>
<NEKTAR>

    <EXPANSIONS>
    <E COMPOSITE="C[1]" NUMMODES="6" FIELDS="u,v,w,p" TYPE="MODIFIED" />
    <!-- 1 Domain inlet plate upper -->
    <E COMPOSITE="C[2]" NUMMODES="6" FIELDS="u,v,w,p" TYPE="MODIFIED" />
    <!-- 2 Domain inlet plate lower -->
    <E COMPOSITE="C[3]" NUMMODES="6" FIELDS="u,v,w,p" TYPE="MODIFIED" />
    <!-- ****3 Domain square faces up down front meshs**** -->
    <E COMPOSITE="C[4]" NUMMODES="6" FIELDS="u,v,w,p" TYPE="MODIFIED" />
    <!-- 4 Domain upper domain lower in up stream -->
    <E COMPOSITE="C[5]" NUMMODES="6" FIELDS="u,v,w,p" TYPE="MODIFIED" />
    <!-- 5 Domain upper lower downstream  -->
    <E COMPOSITE="C[6]" NUMMODES="6" FIELDS="u,v,w,p" TYPE="MODIFIED" />
    <!-- ***6 Domain down stream back side square*** -->
    <E COMPOSITE="C[7]" NUMMODES="6" FIELDS="u,v,w,p" TYPE="MODIFIED" />
    <!-- 7 Domain down stream after square big one -->
    <E COMPOSITE="C[8]" NUMMODES="6" FIELDS="u,v,w,p" TYPE="MODIFIED" />
    <!-- 7 Domain down stream after square big one -->

   </EXPANSIONS>
  <CONDITIONS>
    <SOLVERINFO>
      <I PROPERTY="SOLVERTYPE"
VALUE="VelocityCorrectionScheme"/>
      <I PROPERTY="EQTYPE"                  VALUE="UnsteadyNavierStokes"
/>
      <I PROPERTY="Projection"              VALUE="Continuous"
/>
      <I PROPERTY="EvolutionOperator"       VALUE="Nonlinear"
 />
      <I PROPERTY="TimeIntegrationMethod"   VALUE="IMEXOrder2"
/>
      <I PROPERTY="Driver"                  VALUE="Standard"
/>
      <I PROPERTY="HOMOGENEOUS"             VALUE="1D"     />
      <I PROPERTY="AdvectionForm"           VALUE="SkewSymmetric"
 />
      <I PROPERTY="Extrapolation"           VALUE="Standard"
/>
      <I PROPERTY="USEFFT"                  VALUE="FFTW"
/>
<I PROPERTY="DEALIASING"           VALUE="ON"                   />
   <!--  <I PROPERTY="SpectralVanishingViscosity"   VALUE="True"
        /> -->

  </SOLVERINFO>

    <PARAMETERS>
      <P> TimeStep      = 0.0001     </P>
      <P> NumSteps      = 2500000    </P>  <!-- 500000  250sec -->
      <P> IO_CheckSteps = 5000       </P>  <!-- 120 check files-->
      <P> IO_InfoSteps  = 10         </P>
      <P> Re            = 200         </P>
      <P> Kinvis        = 1./Re      </P>
      <P> IO_CFLSteps   = 50         </P>
      <P> LZ    = 9       </P>  <!-- 3. * Fastest spanwise     -->
      <P> HomModesZ  = 32      </P>  <!-- how many cells for Z direction
 -->
    </PARAMETERS>

    <VARIABLES>
      <V ID="0"> u </V>
      <V ID="1"> v </V>
      <V ID="2"> w </V>
      <V ID="3"> p </V>
    </VARIABLES>

  <BOUNDARYREGIONS>
      <B ID="0"> C[9]   </B> <!-- Inlet1_upper  -->
      <B ID="1"> C[10]  </B> <!-- Inlet2_Lower  -->
      <B ID="2"> C[11]  </B> <!-- Splitter plate  -->
      <B ID="3"> C[12]  </B> <!-- Upper Boundary  -->
      <B ID="4"> C[13]  </B> <!-- Lower_Boundary  -->
      <B ID="5"> C[14]  </B> <!-- Outlet  -->
      <B ID="6"> C[15]  </B> <!-- Wall_square   -->
   </BOUNDARYREGIONS>

 <BOUNDARYCONDITIONS>

      <REGION REF="0">        <!-- Inlet_upper  -->
        <D VAR="u" VALUE="5" />
        <D VAR="v" VALUE="0" />
<D VAR="w" VALUE="0" />
        <N VAR="p" USERDEFINEDTYPE="H" VALUE="0"/>
      </REGION>

      <REGION REF="1">        <!-- Inlet_lower  -->
        <D VAR="u" VALUE="1" />
        <D VAR="v" VALUE="0" />
<D VAR="w" VALUE="0" />
        <N VAR="p" USERDEFINEDTYPE="H" VALUE="0"/>
      </REGION>

       <REGION REF="2">           <!--Splitter plate  -->
        <D VAR="u" VALUE="0" />
        <D VAR="v" VALUE="0" />
<D VAR="w" VALUE="0" />
        <N VAR="p" USERDEFINEDTYPE="H" VALUE="0" />
      </REGION>


      <REGION REF="3">     <!-- Upper Boundary  -->
        <N VAR="u" USERDEFINEDTYPE="H" VALUE="0" />
        <D VAR="v" VALUE="0" />
<N VAR="w" USERDEFINEDTYPE="H" VALUE="0" />
        <N VAR="p" USERDEFINEDTYPE="H" VALUE="0" />
      </REGION>

       <REGION REF="4">     <!-- Lower_Boundary  -->
        <N VAR="u" USERDEFINEDTYPE="H" VALUE="0" />
        <D VAR="v" VALUE="0" />
<N VAR="w" USERDEFINEDTYPE="H" VALUE="0" />
        <N VAR="p" USERDEFINEDTYPE="H" VALUE="0" />
      </REGION>

       <REGION REF="5">     <!-- Outlet  -->
        <N VAR="u" USERDEFINEDTYPE="HOutflow" VALUE="0" />
        <N VAR="v" USERDEFINEDTYPE="HOutflow" VALUE="0" />
<N VAR="w" USERDEFINEDTYPE="HOutflow" VALUE="0" />
        <D VAR="p" USERDEFINEDTYPE="HOutflow" VALUE="0" />
      </REGION>

       <REGION REF="6">      <!-- WallA_square  -->
        <D VAR="u" VALUE="0" />
        <D VAR="v" VALUE="0" />
<D VAR="w" VALUE="0" />
        <N VAR="p" USERDEFINEDTYPE="H" VALUE="0" />
      </REGION>

    </BOUNDARYCONDITIONS>

    <!-- We initialise from pre-computed flow for speed -->
    <FUNCTION NAME="InitialConditions">
         <E VAR="w" VALUE="awgn(1e-3)*cos(2*PI*z/LZ)" />
      <!--  <F VAR="u,v,p,w" FILE="SquareN3D_179.chk" /> -->
       <!-- <E VAR="u,v,w,p" VALUE="0" />   -->
         <F VAR="u,v,p" FILE="SquareN2D_200.chk" />                 <!--
start from 2D results    -->
    </FUNCTION>
    <FUNCTION NAME="ExactSolution">
      <E VAR="u" VALUE="0" />
      <E VAR="v" VALUE="0" />
      <E VAR="w" VALUE="0" />
      <E VAR="p" VALUE="0" />
    </FUNCTION>

  </CONDITIONS>

  <FILTERS>
     <FILTER TYPE="AeroForces">
      <PARAM NAME="OutputFile">stats/stats1/CylinderForces3D</PARAM>
      <PARAM NAME="OutputFrequency">10</PARAM>
      <PARAM NAME="Boundary"> B[6] </PARAM>
    </FILTER>
</FILTERS>
</NEKTAR>
/////////////////////////////////

please help me in this
Regrads,
cheers,
Reda PhD student
Aerospace department
UPC Barcelona

[Nektar-users] Hi all error ending my simulation

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