[angela521a]

Hi fredo490
I want to run a 2-D moving mesh case with the top and bottom walls moving inside while the left and right walls moving outside. Unfortunately, the mesh node motion is not correct,and the mesh can only move in one direction.The key options are list below:
/////dynamicMeshDict
dynamicFvMesh dynamicMotionSolverFvMesh;
motionSolverLibs ("libfvMotionSolvers.so");
solver velocityComponentLaplacian;
velocityComponentLaplacianCoeffs
{
component x;
diffusivity directional (1 200 0);
component y;
diffusivity directional (1 200 0);
}
//////dynamicMeshDict

/////pointMotionUx

boundaryField
{
leftWall
{
type uniformFixedValue;
uniformValue constant 50;
}
rightWall
{
type uniformFixedValue;
uniformValue constant -50;
}
upwall
{
type slip;
}
downwall
{
type slip;
}
frontAndBack
{
type empty;
}

}
/////pointMotionUx


/////pointMotionUy
boundaryField
{
leftWall
{
type slip;
}
rightWall
{
type slip;
}

upwall
{
type uniformFixedValue;
uniformValue constant 50;
}
downwall
{
type uniformFixedValue;
uniformValue constant -50;
}
frontAndBack
{
type empty;
}

}
/////pointMotionUy


can you help me with this?

[ZakiLeon]

Hi,
To provide a movement to a certain boundary, you need to define a movement function, and then apply this movement to certain boundary.

But I still don't understand what the parameters means in the pointMotionU file. We're suppose to define a speed for the boundary but the tutorial movingCone provides only an amplitude and a frequency which one is about speed?
Any answer would be appreciated

[Amrita_Dixit]

Hello Everyone!!


I am using he same pointDisplacement code.Since I am new to dynamicMesh implementation.I am not able to understand the error.It says " /home/dell/OpenFOAM/OpenFOAM-6/src/OpenFOAM/lnInclude/typeInfo.H:110:16: error: cannot dynamic_cast ‘r’ (of type ‘const class Foam:ointPatchField<Foam::Vector<double> >’) to type ‘class Foam::Field<Foam::Vector<double> >&’ (conversion casts away constness)
110 | return dynamic_cast<To&>(r);"
How can I rectify it.I am simulating shrinkage during solidification in openfoam.

[ZakiLeon]

Hi,
I don't have enough information to understand your case. Are you trying to move a boundary of a fluid domain? If so, you need a dynamicMeshDict in case/constant to specify the type of movement (let say displacementLaplacian in your case) and then a file called pointDisplacement in case/0 to specify the details of the movement (frequency, amplitude).

If the movement is not only for a boundary but also for a whole fluid domain, you can specify the movement directly in constant/dynamicMeshDict.

Have you done all of this?
Make sure to use the right solver (rhoPimpleFoam if compressible, pimpleFoam if not) as well as specifying the right one in system/controlDict.

[ZakiLeon]

I found the answer to my previous messages, in pointMotionUx, amplitude actually means speed.