[Rajl]

Originally Posted by GerhardHolzinger

Let me share a recent observation of mine.

I simulated axi-symmetric gas flow in a long pipe. As the domain is quite large, the simulation was run using several parallel processes. The scotch decomposition created a processor boundary, which zic-zags through the pipe.

The part of the processor boundary, which is parallel to the flow, seems to create some disturbance in the pressure field. Luckily, the disturbance does not blow up the simulation, yet it's quite interesting.

The attached images show the pressure field. The involved subdomains are shown as white wireframes.

Hi.. Were yoou able to eliminate the zig zags in the parallel subdomains?

[Nidalsb]

Hello Tobi,

Have you found a solution to this? I have been struggling with this issue lately with 2 cyclic pairs in my simulation. Running in series gives me completely different results for Pressure in only the Z direction, the x and y directions are the completely unchanged though. very confusing. Tried different methods of decomposition and nothing seems to help