[pruthvi1991]

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.

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