Temperature field started diverging even when mesh is refined

syedalam786123 · April 12, 2021, 7:45pm

Hello,

I have also ran a simulation without the boundary condition on the fan plane and still had divergence error.

The simulation worked for low velocity but when it comes to high velocity around Mach 0.8 i start to get these errors.

Regard,

Syed

syedalam786123 · April 12, 2021, 7:53pm

Here is another paper simulating this in a similar way,

Ricardopg · April 12, 2021, 8:24pm

Hi,

I’m not exactly sure what software was used in this latest image that was posted, however I would highly recommend that you search for information on what exacly a “Pressure outflow” boundary condition means and in what cases it’s used.

Nomenclature issues are common, and, although similar, SimScale’s pressure outlet does not behave mathematically the same as a pressure outflow BC.

Cheers

syedalam786123 · April 12, 2021, 8:39pm

hi

Thank you so much for your reply.

From this paper they used pressure outlet boundary condition using Star CCM++.

syedalam786123 · April 12, 2021, 8:49pm

here is another paper related to the same this. This also uses StarCCM++.

Ricardopg · April 12, 2021, 8:51pm

Hi,

Feel free to continue using this approach, however, for OpenFOAM purposes, I can tell you for sure that it’s very unstable and not recommended at all.

I hope this clarifies any misunderstandings related to the nomenclature of BCs.

Cheers

syedalam786123 · April 12, 2021, 8:55pm

Hi,

If i know my Mass flow rate, can i just use a boundary condition on the fan plane.