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<div class="local-toc"><ul>
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<li><a class="reference internal" href="#">forceModel_scalarGeneralExchange command</a><ul>
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<li><a class="reference internal" href="#syntax">Syntax</a></li>
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<li><a class="reference internal" href="#examples">Examples</a></li>
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<li><a class="reference internal" href="#description">Description</a></li>
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<li><a class="reference internal" href="#restrictions">Restrictions</a></li>
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<li>forceModel_scalarGeneralExchange command</li>
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<div class="section" id="forcemodel-scalargeneralexchange-command">
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<span id="index-0"></span><h1>forceModel_scalarGeneralExchange command<a class="headerlink" href="#forcemodel-scalargeneralexchange-command" title="Permalink to this headline">¶</a></h1>
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<div class="section" id="syntax">
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<h2>Syntax<a class="headerlink" href="#syntax" title="Permalink to this headline">¶</a></h2>
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<p>Defined in couplingProperties dictionary.</p>
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<div class="highlight-python"><div class="highlight"><pre>forceModels
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(
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scalarGeneralExchange // must be 2nd position!
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);
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scalarGeneralExchangeProps
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{
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useLiMason "switch1"; //default: DeenEtAl
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useGeneralCorrelation "switch3"; //default: DeenEtAl
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generalCorrelationParameters (1 2 3 4 5 6 7 8);
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verbose "switch2";
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velFieldName "U";
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voidfractionFieldName "voidfraction";
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tempFieldName "T";
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partTempName "Temp";
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/* partHeatFluxName "convectiveHeatFlux"; //switch off for implicit coupling, e.g., to ParScale */
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partHeatTransCoeffName "heatTransCoeff";
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partHeatFluidName "heatFluid";
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lambda value;
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Cp value1;
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//Lists with information for each species FOR THE PARTICLES
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//MUST be in the same order as eulerian species in 'scalarTransportProperties'
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//MUST correspond to property/atom in ligghts (use 'couple/cfd/speciesConvection' to auto-generate individual fields)
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partSpeciesNames
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(
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speciesC
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);
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partSpeciesFluxNames
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(
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speciesCFlux
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);
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partSpeciesTransCoeffNames
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(
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speciesCTransCoeff
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);
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partSpeciesFluidNames
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(
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speciesCFluid
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);
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DMolecular
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(
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value2
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);
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interpolation "bool1";
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voidfractionInterpolationType "type1"
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UInterpolationType "type2"
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fluidScalarFieldInterpolationType "type2"
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scalarViscosity switch5;
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nu scalar5;
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suppressProbe switch6;
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scale scalar6;
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maxSource scalar7;
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}
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</pre></div>
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</div>
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<ul class="simple">
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<li><em>switch1</em> = (optional) flag to use Nusselt correlations of Li and Mason (2000)</li>
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<li><em>switch2</em> = (normally off) for verbose run</li>
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<li><em>switch3</em> = (optional) flag to use a general Nusselt number correlation (must specify parameters of this correlation in a list called ‘generalCorrelationParameters’ )</li>
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<li>generalCorrelationParameters = list with a predefined number of parameters (for length see src code, only read if useGeneralCorrelation is set to true)</li>
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<li><em>U</em> = name of the finite volume fluid velocity field</li>
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<li><em>voidfraction</em> = name of the finite volume voidfraction field</li>
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<li><em>T</em> = name of the finite volume scalar temperature field</li>
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<li><em>Temp</em> = name of the DEM data representing the particles temperature</li>
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<li><em>convectiveHeatFlux</em> = name of the DEM data representing the particle-fluid convective heat flux</li>
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<li><em>heatTransCoeff</em> = name of the DEM data representing the particle-fluid heat transfer coefficient</li>
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<li><em>heatFluid</em> = name of the DEM data representing the fluid heat</li>
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<li><em>value</em> = fluid thermal conductivity [W/(m*K)]</li>
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<li><em>value1</em> = fluid specific heat capacity [W*s/(kg*K)]</li>
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<li><em>speciesC</em> = name of the DEM data representing the transport species of the particles</li>
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<li><em>speciesCFlux</em> = name of the DEM data representing the particle-fluid species flux</li>
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<li><em>speciesCTransCoeff</em> = name of the DEM data representing the particle-fluid species transfer coefficient</li>
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<li><em>speciesCFluid</em> = name of the DEM data representing the transport species of the fluid</li>
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<li><em>value2</em> = molecular diffusion coefficient [m^2/s]</li>
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<li><em>bool1</em> = (optional, normally off) flag to use interpolated voidfraction and fluid velocity values</li>
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<li><em>type1</em> = (optional, default cellPoint) interpolation type for voidfraction field</li>
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<li><em>type2</em> = (optional, default cellPointFace) interpolation type for velocity field</li>
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<li><em>type3</em> = (optional, default cellPoint) interpolation type for fluidScalarField field</li>
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<li><em>switch5</em> = (optional, default false) sub model switch, see <a class="reference internal" href="forceSubModel.html"><em>forceSubModel</em></a> for details</li>
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<li><em>scalar5</em> = (optional) optional, only if switch5 is true</li>
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<li><em>switch6</em> = (optional, default false) can be used to suppress the output of the probe model</li>
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<li><em>scalar7</em> = (optional) scaling of particle diameter</li>
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<li><em>scalar7</em> = limit maximal turbulence</li>
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</ul>
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</div>
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<div class="section" id="examples">
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<h2>Examples<a class="headerlink" href="#examples" title="Permalink to this headline">¶</a></h2>
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<div class="highlight-python"><div class="highlight"><pre>forceModels
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(
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scalarGeneralExchange // must be 2nd position!
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);
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scalarGeneralExchangeProps
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{
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useLiMason false; //default: DeenEtAl
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useGeneralCorrelation true; //default: DeenEtAl
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generalCorrelationParameters
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(
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7.0 -10 5
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1.0 0.17
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1.33 -2.31 1.16
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);
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verbose false;
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velFieldName "U";
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voidfractionFieldName "voidfraction";
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tempFieldName "T";
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partTempName "Temp";
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/* partHeatFluxName "convectiveHeatFlux"; //switch off for implicit coupling, e.g., to ParScale */
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partHeatTransCoeffName "heatTransCoeff";
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partHeatFluidName "heatFluid";
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lambda 0.0271;
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Cp 1007;
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//Lists with information for each species FOR THE PARTICLES
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//MUST be in the same order as eulerian species in 'scalarTransportProperties'
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//MUST correspond to property/atom in ligghts (use 'couple/cfd/speciesConvection' to auto-generate individual fields)
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partSpeciesNames
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(
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speciesC
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);
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partSpeciesFluxNames
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(
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speciesCFlux
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);
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partSpeciesTransCoeffNames
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(
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speciesCTransCoeff
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);
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partSpeciesFluidNames
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(
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speciesCFluid
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);
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DMolecular
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(
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1e-5
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);
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}
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</pre></div>
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</div>
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</div>
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<div class="section" id="description">
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<h2>Description<a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h2>
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<p>This “forceModel” does not influence the particles or the fluid flow!
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Using the particles’ temperature and/or species a scalar field
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representing “particle-fluid heatflux” and/or “particle-fluid speciesflux” is calculated.</p>
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<p>This code is designed to realize coupled CFD-DEM simulations using LIGGGHTS
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and OpenFOAM(R). Note: this code is not part of OpenFOAM(R) (see DISCLAIMER).</p>
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<p>Two way general scalar exchange between DEM and CFD
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convective heat and species transfer model. The standard model is that of
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Deen, N.G. et al., Review of direct numerical simulation of
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fluid-particle mass, momentum and heat transfer in dense gas-solid flows.
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Chemical Engineering Science 116 (2014) 710-724.
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This correlation is based on that of Gunn (1978).</p>
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<p>The switch ‘useGeneralCorrelation’ allows one to specify the parameters
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of the Gunn correlation as a list called ‘generalCorrelationParameters’.</p>
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<p>Alternatively, the correclation of
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Li and Mason (2000), A computational investigation of transient heat
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transfer in pneumatic transport of granular particles, Pow.Tech 112
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can be activated. However, this correlation is not suitable for
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dense granular flows.</p>
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<p>WARNING:
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This model REQUIRES the ‘generalManual’ speciesTransportModel</p>
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</div>
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<div class="section" id="restrictions">
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<h2>Restrictions<a class="headerlink" href="#restrictions" title="Permalink to this headline">¶</a></h2>
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<p>Goes only with cfdemSolverPimpleImEx and cfdemSolverPisoSTM. The force model has to be the second (!!!) model in the forces list.</p>
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</div>
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<div class="section" id="related-commands">
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<h2>Related commands<a class="headerlink" href="#related-commands" title="Permalink to this headline">¶</a></h2>
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<p><a class="reference internal" href="forceModel.html"><em>forceModel</em></a> <a class="reference internal" href="forceModel_LaEuScalarTemp.html"><em>forceModel_LaEuScalarTemp</em></a></p>
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