pimpleFoam with cyclic BCs

RodriguezFatz · November 3, 2014, 03:37

Yes, I saw these pressure wiggles as well in my cases, but I didn't pay too much attention to them. I don't know if they are due to bad numerical settings or some bug in the code. Perhaps you can write a bug report with that small test case.

Vino · October 13, 2017, 05:31

Dear ArathoN and Philipp,

I am trying to simulate square duct problem (Re=3500) using cyclic inlet outlet with fvOptions. I am using OpenFOAM 4.1 with simpleFoam with k-epsilon model.

I am not getting convergence for pressure & cross stream velocities. However, I am getting fully developed velocity profile in stream wise direction. Also, gradP term reaches steady state.

Could you please give me your suggestions to improve the convergence?

The case file that I used is available in the following link:

https://github.com/vino-123/square_duct_cyclic_inout

The following are the convergence I got with above case settings.

Convergence:
https://drive.google.com/open?id=0B1...2hnUkVjQkZtVjQ

gradP:
https://drive.google.com/open?id=0B1...3ZLeDhieGd2ZEU

Ubar:
https://drive.google.com/open?id=0B1...ktVM3NmOExNcU0

Thank you very much for your help.

November 3, 2014, 03:37		#21
RodriguezFatz Senior Member Philipp Join Date: Jun 2011 Location: Germany Posts: 1,297 Rep Power: 27	Yes, I saw these pressure wiggles as well in my cases, but I didn't pay too much attention to them. I don't know if they are due to bad numerical settings or some bug in the code. Perhaps you can write a bug report with that small test case. __________________ The skeleton ran out of shampoo in the shower.

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October 13, 2017, 05:31		#22
Vino Senior Member Vino Join Date: Mar 2013 Posts: 130 Rep Power: 13	Dear ArathoN and Philipp, I am trying to simulate square duct problem (Re=3500) using cyclic inlet outlet with fvOptions. I am using OpenFOAM 4.1 with simpleFoam with k-epsilon model. I am not getting convergence for pressure & cross stream velocities. However, I am getting fully developed velocity profile in stream wise direction. Also, gradP term reaches steady state. Could you please give me your suggestions to improve the convergence? The case file that I used is available in the following link: https://github.com/vino-123/square_duct_cyclic_inout The following are the convergence I got with above case settings. Convergence: https://drive.google.com/open?id=0B1...2hnUkVjQkZtVjQ gradP: https://drive.google.com/open?id=0B1...3ZLeDhieGd2ZEU Ubar: https://drive.google.com/open?id=0B1...ktVM3NmOExNcU0 Thank you very much for your help.