# Problems with MFIX code and Parallel Processing.

 Register Blogs Members List Search Today's Posts Mark Forums Read

 August 23, 2006, 13:47 Problems with MFIX code and Parallel Processing. #1 Fernando Pio Guest   Posts: n/a Sponsored Links Hello, I´m use MFIX code (Multiphase Flows with Interphase eXchanges) for to simulate a gas-solid flows in a circulating fluidized bed. The main objective is to investigate the numeric diffusion. Thus, the sufficiently refined mesh is very important. Then, parallel processing with two machines (PC´s) was prepared (cluster), but the problems are not converging. The convergence is guaranteed if just one machine is used. Could somebody tell me why the problems are not converging using the MFIX code with parallel processing (of PC´s)? The operational system is a Mandrake Linux 10.1 and the Intel Fortran Compiler (Fortran 90). Thanks. Thanks.

 August 23, 2006, 16:10 Re: Problems with MFIX code and Parallel Processin #2 agg Guest   Posts: n/a Are you specifying gas as incompressible fluid in MFIX? If so, try to use it as compressible fluid (specify average molecular wt. and gas temperature).

 August 24, 2006, 10:44 Re: Problems with MFIX code and Parallel Processin #3 Fernando Pio Guest   Posts: n/a Hello, Yes, the gas is incompressible fluid and it can not be changed in MFIX.

 August 24, 2006, 11:23 Re: Problems with MFIX code and Parallel Processin #4 agg Guest   Posts: n/a If you specified RO_g, the gas is treated as incompressible. For compressible flow, you should specify Mw_avg (average molecule weight), P_g and T_g in initial and boundary conditions. Hanzo likes this.

 August 29, 2006, 14:33 Re: Problems with MFIX code and Parallel Processin #5 Fernando Pio Guest   Posts: n/a Hi, thanks for your message. I need to treat the gas as incompressible flow. I think that the divergence was caused by the parallel computing. In my opinion, something is happening with the solution when the problem is divided by the process in the cluster. The installation this correct one, therefore has convergence when i consider only one machine. According to your experience, it will be that the problem can be in the division of the problem in the cluster? What it could be occurring? Thanks for all. Esmaeel likes this.

 Thread Tools Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post thibault_pringuey OpenFOAM Programming & Development 2 August 27, 2013 22:03 askjak OpenFOAM Bugs 18 October 27, 2010 03:35 gholamghar Main CFD Forum 0 August 1, 2010 01:55 pan_zh Main CFD Forum 0 November 7, 2009 21:34 John C. Chien Main CFD Forum 19 May 17, 2001 15:56