CFX4.4 Multi-fluid (delft model) problem
 

Hello

I get this error when running my 3D fluidised bed case: (taken from output file, i.e fortran compiles fine)

THE VOLUME FRACTIONS AT THE BOUNDARY NODE BETWEEN CELL ( 1 1 1) AND CELL ( 1 0 1) IN BLOCK BLOCK-NUMBER-1 DO NOT SUM TO 1.0.

THE VOLUME FRACTIONS AT THE BOUNDARY NODE BETWEEN CELL ( 2 1 1) AND CELL ( 2 0 1) IN BLOCK BLOCK-NUMBER-1 DO NOT SUM TO 1.0.

etc....

TEN VOLUME FRACTION BOUNDARY NODE ERRORS HAVE BEEN DISPLAYED OUT OF A TOTAL OF 31296 *** ERRORS IN SETTING REAL BOUNDARY CONDITIONS

THE CFX-4 SOLVER HAS BEEN STOPPED BY SUBROUTINE CMDBCS

I have checked my fortran file many times, infact the same file (with a few minor adjustments) work for the 2d case. Why will it not work for 3d, and b4 anyone else asks, Yes I have checked that my Volume fraction sums to 1. I have even tried using the IPALL routine instead of IPREC and still get the same errors. Can anyone suggest something feasible?? Could it be the geometry file?

Cheers

Re: CFX4.4 Multi-fluid (delft model) problem
 

Try to set the INITIAL GUESS to CONSTANT GUESS (under the command file) and specify the initial volume fractions for both phases. If you have a fluidised bed I believe that you're using the USRINT subroutine. I'd suggest to check out these values under the subroutine.
Good luck, cfd guy

Re: CFX4.4 Multi-fluid (delft model) problem
 

Thanks for your response 'CFD Guy'.

However, I don't believe your suggestion to set a constant guess will make a difference to my problem. The USRINT file overides the initial guess command set in the command file, so changing it to a constant guess will make things unsuitable...

I was considering setting the boundary condition (volume fraction between boundary node [1 0 1] and cell [1 1 1] for example) using USRBCS. Do you think this could be a feasible solution? I am new to the Fortran side of CFX so any help/comments will be valuable.

ps, I am adament there is nothing wrong with my definition of volume fraction in the USERINT file (it works fine for the 2d case).

Cheers

Re: CFX4.4 Multi-fluid (delft model) problem
 

Richie,
All I can say is that I've already had this problem but I don't remember how I fixed it. I believe my problem was the values, I was setting 1 instead of 1.0 for volume fraction in the command file. In the subroutine try to use 1.0d0 (for double precision) instead of 1 (without dot) value.
Good luck, cfd guy

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