Dear Daniel, The output value is the Drag force, so you will need to non-dimensionalize it to produce the drag coefficient according to the diameter of the cylinder. Kind regards, Alexandra On Wed, 29 May 2024, 17:21 Daniel Rubano Barretto Turci, < daniel_turci@id.uff.br> wrote:
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Hi all,
I am running an 2D incompressible Navier Stokes simulation with a dimensionless setup and using the AerForces filter.
I am trying to reproduce results from the literature that use the drag coefficient defined as Cd = 2*Fd/(rho*U*U*D), where Fd is the drag force per unit of length and D is the diameter of a cylinder. I wish to know whether the value exported to the file DragLift.fce is half the Cd as defined previously or the Cd itself. I think it is the former, but I would like a confirmation.
For reference, I am sending a snippet of the session xml file.
<SOLVERINFO> <I PROPERTY="SolverType" VALUE="VelocityCorrectionScheme" /> <I PROPERTY="EQTYPE" VALUE="UnsteadyNavierStokes" /> <I PROPERTY="EvolutionOperator" VALUE="Nonlinear" /> <I PROPERTY="Projection" VALUE="Galerkin" /> <I PROPERTY="GlobalSysSoln" VALUE="DirectStaticCond" /> <I PROPERTY="TimeIntegrationMethod" VALUE="IMEXOrder2" /> <I PROPERTY="Driver" VALUE="Standard" /> <I PROPERTY="SPECTRALHPDEALIASING" VALUE="True" /> </SOLVERINFO>
<PARAMETERS> <P> TimeStep = 0.01 </P> <P> FinTime = 20 </P> <P> NumSteps = FinTime/TimeStep </P> <P> IO_CheckSteps = NumSteps/20 </P> <P> IO_InfoSteps = 5 </P> <P> IO_FiltersInfoSteps = 100 </P> <P> IO_CFLSteps = 10 </P> <P> Re = 66 </P> <P> Kinvis = 1/Re </P> </PARAMETERS>
<FILTERS> <FILTER TYPE="AeroForces"> <PARAM NAME="OutputFile"> DragLift </PARAM> <PARAM NAME="OutputFrequency"> 5 </PARAM> <PARAM NAME="Boundary"> B[3] </PARAM> </FILTER>
-- Daniel Rubano B. Turci D. Sc. Student at Universidade Federal Fluminense (UFF). Laboratory of Thermal Sciences - LATERMO. *Rua Passo da Pátria, 156, Bloco D, sala 302, Niterói. RJ - 24210-240, Brazil.* _______________________________________________ Nektar-users mailing list Nektar-users@imperial.ac.uk https://mailman.ic.ac.uk/mailman/listinfo/nektar-users