[blue8803]

Hello.


I'm now struggling to find the adequate boundary conditon for the pointDisplacment at the immersed boundary.


pointDisplacement is pointVectorField, and I guess there is no proper BC for pointVectorField in the implemented IB method (foam-extend 4.1).
In that case, I may have to implement some BC for pointVectorField..?



Could you give me any comments or hints for this?

Many thanks.

[geth03]

is there a typo in zeroGradientIB?
i mean, did you mean just zeroGradient?

[blue8803]

Originally Posted by geth03

is there a typo in zeroGradientIB?
i mean, did you mean just zeroGradient?

Thank you for your reply.

When I use zeroGradientIB, the result is the same as above.
As you can see in the picture (right), FOAM recommended 24 patchField type, which have nothing to do with IB.


When I use zeroGradient, then simulation move next step. However, another error occur (below).

I think it is related with that the zeroGradient BC is not proper for the IB.


----------------------------------------------------------------------------------------------------------------------
--> FOAM FATAL ERROR:
Not implemented

From function immersedBoundary::gradientInternalCoeffs()
in file lnInclude/fvPatchField.H at line 473.

FOAM aborting

Aborted (core dumped)
----------------------------------------------------------------------------------------------------------------------

[blue8803]

I use motionU instead of pointDisplacement for the dynamic mesh motion.
In addition, I made(link?) a boundary condition of tetPointVectorField for the immersedBoundary.

eddited class
/foam
/tetFiniteElement