# 2D flow with non zero out-of-plane component

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 October 5, 2012, 11:07 2D flow with non zero out-of-plane component #1 New Member   Guillaume Terlinden Join Date: Nov 2011 Posts: 11 Rep Power: 6 Hi foamers! I'm trying to compute a 2D flow in the (x,y) plane but the trick is that flow has non zero Ux Uy and Uz component. All components are functions of x and y only though. Does anybody know how I can do such a run ? The problem is, with "empty" BC to have a 2D case, the Uz component is set to zero by the solver (even though the inflow Uz is non zero)... What I am currently doing is computing a 3D flow with a few cells in the z direction and with cyclic BC, but this is not computationnally efficient at all, so I am trying to find a way to resolve the system in 2D only.

October 27, 2012, 08:57
#2
Member

Carlos Xisto
Join Date: Nov 2009
Location: Covilhã, Portugal
Posts: 53
Rep Power: 8
Quote:
 Originally Posted by mevoili Hi foamers! I'm trying to compute a 2D flow in the (x,y) plane but the trick is that flow has non zero Ux Uy and Uz component. All components are functions of x and y only though. Does anybody know how I can do such a run ? The problem is, with "empty" BC to have a 2D case, the Uz component is set to zero by the solver (even though the inflow Uz is non zero)... What I am currently doing is computing a 3D flow with a few cells in the z direction and with cyclic BC, but this is not computationnally efficient at all, so I am trying to find a way to resolve the system in 2D only.
My suggestion is to write an equation to each component of Ux, Uy, Uz.

Carlos

 October 29, 2012, 06:46 #3 New Member   Guillaume Terlinden Join Date: Nov 2011 Posts: 11 Rep Power: 6 What do you mean ? Should I write my own solver then ?

October 29, 2012, 07:31
#4
Member

Carlos Xisto
Join Date: Nov 2009
Location: Covilhã, Portugal
Posts: 53
Rep Power: 8
Quote:
 Originally Posted by mevoili What do you mean ? Should I write my own solver then ?
Yes! You should write your own solver..

You need something like this.

fvScalarMatrix UxEqn
(
fvm::ddt(rho, Ux)
+ fvm::div(phi,Ux)
);

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