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Forum: OpenFOAM Running, Solving & CFD

March 31, 2009, 10:50

Replies: 44

Uniform Flow around a cylinder

Views: 5,978

Posted By lin

I'm not sure,but generally it seems to be a...

I'm not sure,but generally it seems to be a general rule to prescribe inlet values of turbulent quantites.You could guess the value or use the value from experimental results.

Forum: OpenFOAM Running, Solving & CFD

March 20, 2009, 10:57

Replies: 44

Uniform Flow around a cylinder

Views: 5,978

Posted By lin

If I were you. 1. More grid around the...

If I were you.

1. More grid around the cylinder
2. change the residual to smaller value

what is the distance from you first grid to the cylinder?

Forum: OpenFOAM Running, Solving & CFD

March 13, 2009, 11:39

Replies: 44

Uniform Flow around a cylinder

Views: 5,978

Posted By lin

For the tolerance Take this o

For the tolerance
Take this one for example:
tolerance 1e-12;
relTol 0.01;

You change only the "tolerance" ,not "relTol".If you check the user guide,you will know this the solver will...

Forum: OpenFOAM Running, Solving & CFD

March 13, 2009, 06:17

Replies: 44

Uniform Flow around a cylinder

Views: 5,978

Posted By lin

Hi,Bin From the first glanc

Hi,Bin

From the first glance of your files,I think you are "lazy",you should just copy it from some other place and never change it,just I do. After my searching the forum,I plan my next step is...

Forum: OpenFOAM Running, Solving & CFD

March 13, 2009, 05:14

Replies: 44

Uniform Flow around a cylinder

Views: 5,978

Posted By lin

Hi,bin Since you do not men

Hi,bin

Since you do not mention your fvscheme and fvsolution file.I don't know the detail.Try use higher order discretization method and more stringent tolerance and see if it help.

You...

Forum: OpenFOAM Running, Solving & CFD

March 12, 2009, 18:12

Replies: 44

Uniform Flow around a cylinder

Views: 5,978

Posted By lin

Hi,Bin Nice to see your res

Hi,Bin

Nice to see your results.In fact,I'm doing similiar work now,on the contrary,My interest is in the range of large Re,10^5--10^7. I admire your interest range,at least you are not bothered...

Forum: OpenFOAM Running, Solving & CFD

March 8, 2009, 07:55

Replies: 44

Uniform Flow around a cylinder

Views: 5,978

Posted By lin

Hi,zhoubin You mean you sol

Hi,zhoubin

You mean you solve the problem after you scale the computational domain?

I also consider the problem and wonder if it is caused by the extreme low Re.If you like,you could try...

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