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aoun January 25, 2012 10:20

flow around cylinders
 
Hi every one,

I simulate turbulent crossflow around tube bundle (many tubes: 7 rows by 7 columbs) using different turbulence models.

the convergence is very hard since the residual of continuty equation is relatively high 10^-2 ??

who can I getting a fully converged system khowing that I have minimise the under-relaxation factors, modifies the scheme of disretization,

what other things ?

shk12345 January 25, 2012 10:48

Quote:

Originally Posted by aoun (Post 341096)
Hi every one,

I simulate turbulent crossflow around tube bundle (many tubes: 7 rows by 7 columbs) using different turbulence models.

the convergence is very hard since the residual of continuty equation is relatively high 10^-2 ??

who can I getting a fully converged system khowing that I have minimise the under-relaxation factors, modifies the scheme of disretization,

what other things ?

Just try to use coupled scheme for discretization it gives the best and fastest convergence

If it is also not working then try to refine your mesh and decrease the squeness of your mesh


hope that helps
shk

mali28 January 25, 2012 14:20

Quote:

Originally Posted by aoun (Post 341096)
Hi every one,

I simulate turbulent crossflow around tube bundle (many tubes: 7 rows by 7 columbs) using different turbulence models.

the convergence is very hard since the residual of continuty equation is relatively high 10^-2 ??

who can I getting a fully converged system khowing that I have minimise the under-relaxation factors, modifies the scheme of disretization,

what other things ?

Here are some general guidelines which can help you get a converged solution:

http://cape-forum.com/index.php/topic,17.0.html


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