[Hgholami]

Dear Foamer
In fluidSolidInterface.C, in line 2115 (class updateForce), after transferring fluid forces to solid, it mentioned "Set interface pressure for elasticWallPressure boundary condition" as:

forAll(fluid().globalPatches(), i)
{
if
(
isA<elasticWallPressureFvPatchScalarField>
(
fluid().p().boundaryField()[fluidPatchIndices()[i]]
)
)
{
const_cast<elasticWallPressureFvPatchScalarField&>
(
refCast<const elasticWallPressureFvPatchScalarField>
(
fluid().p().boundaryField()[fluidPatchIndices()[i]]
)
).prevPressure() = fluid().patchPressureForce(fluidPatchIndices()[i]);
}
}

My question is why ".prevPressure()" is mentioned here?
what is aim of this part?
similar case is in updateMovingWallPressureAcceleration class "prevAcceleration()".
Thanks,

[Hgholami]

This part of code relative to elasticWallPressure boundary condition, so in its boundary condition, we need prevPressure_ and prevAcceleration_ in line 334 and 342.