fixedGradient boundary condition

skabilan · November 17, 2009, 20:44

Hi All,

I am working with scalarTransportFoam. I have specified a fixedGradient boundary condition at one of the boundary patches.

inlet
{
type fixedGradient;
gradient uniform 1.5;
}

I need to change the gradient value (i.e, 1.5) between iterations.

Any suggestions?

Thanks in advance!
Senthil

skabilan · November 18, 2009, 14:43

Finally, I figured out how to do it...

if(mesh.boundaryField()[patchIMesh1].type() == "fixedGradient")
{
fixedGradientFvPatchScalarField& bufferMesh1= refCast<fixedgradientfvpatchscalarfield>(T.boundar yField()[patchIMesh1]);
scalarField& gradMesh1 = bufferMesh1.gradient();
forAll (bufferMesh1, faceI)
{
gradMesh1[faceI] = ...
}
}

Dont forget to include fixedGradientFvPatchScalarFields.H file before main()

Senthil

skabilan · December 3, 2009, 13:55

There is an error in the aforementioned code...it should be

if(T.boundaryField()[patchIMesh1].type() == "fixedGradient")

not

if(mesh.boundaryField()[patchIMesh1].type() == "fixedGradient")

Where T is the field that needs to be altered.

November 17, 2009, 20:44	fixedGradient boundary condition	#1
skabilan Senior Member Senthil Kabilan Join Date: Mar 2009 Posts: 113 Rep Power: 17	Hi All, I am working with scalarTransportFoam. I have specified a fixedGradient boundary condition at one of the boundary patches. inlet { type fixedGradient; gradient uniform 1.5; } I need to change the gradient value (i.e, 1.5) between iterations. Any suggestions? Thanks in advance! Senthil

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November 18, 2009, 14:43		#2
skabilan Senior Member Senthil Kabilan Join Date: Mar 2009 Posts: 113 Rep Power: 17	Finally, I figured out how to do it... if(mesh.boundaryField()[patchIMesh1].type() == "fixedGradient") { fixedGradientFvPatchScalarField& bufferMesh1= refCast<fixedgradientfvpatchscalarfield>(T.boundar yField()[patchIMesh1]); scalarField& gradMesh1 = bufferMesh1.gradient(); forAll (bufferMesh1, faceI) { gradMesh1[faceI] = ... } } Dont forget to include fixedGradientFvPatchScalarFields.H file before main() Senthil

December 3, 2009, 13:55		#3
skabilan Senior Member Senthil Kabilan Join Date: Mar 2009 Posts: 113 Rep Power: 17	There is an error in the aforementioned code...it should be if(T.boundaryField()[patchIMesh1].type() == "fixedGradient") not if(mesh.boundaryField()[patchIMesh1].type() == "fixedGradient") Where T is the field that needs to be altered.