[2538sukham]

Hi dear Foamers.
I am trying to model the plunger for a high pressure die casting and the moving wall has an acceleration until a critical time is reached. The mesh seems to be moving fine with layer addition removal as edited from the standard linearValveTopoFvMesh by removing the slider entries.

My problems are:
1. I am confused about the boundary condition as the mesh is moving and the wall velocity is already given in the mesh movement so I gave zeroGradient on the 0/U file for the moving wall. (I saw something called make flux relative in the interDyM solver. Does that take care of the moving mesh?)
2. The alpha or the phase which is simply water is showing discrepancies near the moving wall when it accelerates.

Mesh motion strategy

forAll(patchPoints, ppI)
    {
        if(time().value() <= 1.47) 
			np[patchPoints[ppI]] += (0.04572 (exp(1.8*time().value())-1.0))*time().deltaTValue();
				
		else
			np[patchPoints[ppI]] +=vel().value(time().value())*time().deltaTValue();
    }

Even with this simple arrangement, I am not able to solve these problems

This is my first time posting a querry so please bear with me.
I am writing it in foam extend 4.1