[Other] how to merge two meshes and fields

gasagna · February 26, 2015, 06:18

Hi all,

This is my problem: I wanted to solve for the steady laminar solution past a circular cylinder at Re=100, thus higher than the bifurcation point where instability occurs.

I started by creating only the upper "half" mesh, with a symmetry plane passing through the cylinder with a free-slip boundary condition. This procedure kills the instability and I can obtain the steady solution on this reduced domain with icoFoam, solving the transient problem.

However, I now want to have the steady solution on the complete domain, on a full grid, and start a new simulation from there to observe the growth of the instability.

I started by using rotateMesh and transformPoints to generate the solution also on the lower half. I then used mergeMesh to merge the upper and lower parts, but it appears that the fields are not merged.

Is there any other possible solution to my problem?

Regards,

Davide

vcattoir · June 22, 2017, 07:33

Hello

I have exactly the same problem and am also trying to do that, nothing has worked yet, i had to recompute the steady solution on the whole domain which is quite stupid.

Has anyone any idea ?

Thx

Vcattoir

February 26, 2015, 06:18	how to merge two meshes and fields	#1
gasagna New Member Davide Lasagna Join Date: Jul 2014 Posts: 3 Rep Power: 12	Hi all, This is my problem: I wanted to solve for the steady laminar solution past a circular cylinder at Re=100, thus higher than the bifurcation point where instability occurs. I started by creating only the upper "half" mesh, with a symmetry plane passing through the cylinder with a free-slip boundary condition. This procedure kills the instability and I can obtain the steady solution on this reduced domain with icoFoam, solving the transient problem. However, I now want to have the steady solution on the complete domain, on a full grid, and start a new simulation from there to observe the growth of the instability. I started by using rotateMesh and transformPoints to generate the solution also on the lower half. I then used mergeMesh to merge the upper and lower parts, but it appears that the fields are not merged. Is there any other possible solution to my problem? Regards, Davide

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June 22, 2017, 07:33		#2
vcattoir New Member - Join Date: Oct 2016 Posts: 6 Rep Power: 10	Hello I have exactly the same problem and am also trying to do that, nothing has worked yet, i had to recompute the steady solution on the whole domain which is quite stupid. Has anyone any idea ? Thx Vcattoir