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August 23, 2015, 15:27 |
Time step independence with pimleDyMFoam
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#1 |
Member
Pruthvi
Join Date: Feb 2014
Posts: 41
Rep Power: 12 |
Hello all,
I ran the case of a pitching and plunging flat-plate and i'm trying to establish time-step independence. As I reduce the time-step I notice spikes in the force curve. What is the reason behind these spikes? Please take a look at the force plots below. time_independence_fullview.jpg time_independence.jpg Here are the schemes I'm using. Code:
ddtSchemes { default Euler; } gradSchemes { default Gauss linear; grad(p) Gauss linear; grad(U) Gauss linear; } divSchemes { default none; div(phi,U) Gauss linearUpwind grad(U); div(phi,k) Gauss limitedLinear 1; div(phi,omega) Gauss limitedLinear 1; div((nuEff*dev(T(grad(U))))) Gauss linear; } laplacianSchemes { default Gauss linear limited corrected 0.5; } interpolationSchemes { default linear; } snGradSchemes { default corrected; } fluxRequired { default no; pcorr ; p; } Here is a screenshot of the mesh i'm using. The flat plate is modelled using the createBaffle utility. Meshing with gmsh. flatplate_closeup.jpg flatplate_extruded.jpg |
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Tags |
baffle, mesh independence, pimpledymfoam, time independence |
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