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-   -   fluentmeshtofoam problem (http://www.cfd-online.com/Forums/openfoam/97156-fluentmeshtofoam-problem.html)

niaz February 10, 2012 03:10

fluentmeshtofoam problem
 
Hi Foamers:)
I want to simulate a circular cylinder. I used gambit for making mesh.
and I converted it without any problem. but during the solve, I get unusual value for Cd and Cl. I checked Aref and it is correct but I do not know what the problem is ?:confused:
plz help me:(

nimasam February 10, 2012 04:15

Hi dear Amir
two points:
1) after you import your mesh, use the command "check mesh" and look the result, is it fine?
2) u may use non hexahedral mesh, so maybe you need to use different schemes in your fvSchemes, so try different schemes in ur fvSchemes

3) for non-orthogonal you can increase the correct number in fvSolution

maybe it helps

niaz February 10, 2012 06:54

Dear nima
I have applied your suggestion but I don`t get sutiable answer
and it has still irregular Cd and Cl please check my test case (click on it) if you can?
tnx

nimasam February 10, 2012 13:59

Quote:

Originally Posted by niaz (Post 343770)
Dear nima
I have applied your suggestion but I don`t get sutiable answer
and it has still irregular Cd and Cl please check my test case (click on it) if you can?
tnx

hi i look at your case.
first: it seems everything is fine, did you check whether your simulation is converging or not?
second: Are you sure the calculation of Cd is right?
if answer to both aforementioned questions are yes :D

then i suggest first turn of the turbulence and check whether it returns reasonable result for laminar case or not

niaz February 11, 2012 02:36

Hi Nima
my case is laminar not turb.
tanx it seems that the value of residuals cannot control the loops. and after 1 iteration the pimple loop for Uy exited. I have changed my loop corrector in Fvsolution and it seems more normal value.

nimasam February 11, 2012 03:10

Hi
your simulation may be done in low velocity and it may be fall in low Reynolds number, and it is a laminar case! but i asked you to change the turbulence in the constant folder into laminar :D to omit all turbulence calculation in your case!

However im glad :D you reach a reasonable result:)

niaz February 11, 2012 03:57

Dear Nima
I had set laminar at first:D. the files are for next steps.
but it is running and it still looks good:o
tnx


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