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-   -   Solution Method & turbulent intensity in CFX 5.5.1 (http://www.cfd-online.com/Forums/cfx/19123-solution-method-turbulent-intensity-cfx-5-5-1-a.html)

hamza albazzaz August 14, 2002 19:39

Solution Method & turbulent intensity in CFX 5.5.1
 
hi

I want to know what type of Alogrithem solution method used in CFX5.5.1 is it SIMPLE method?

and what does the defult number of turbulent intensity use in the CFX 5.5.1?

thank you

Neale August 26, 2002 14:46

Re: Solution Method & turbulent intensity in CFX 5
 
No, it's not SIMPLE. CFX-5 is a pressure based coupled flow solver, i.e., solves for u,v,w and p at the same time. There have been threads on this in the past, just search the archives.

The default turbulence levels are given in the manual. 3.7% intensity I think

Neale

Jhonny August 27, 2002 16:05

Re: Solution Method & turbulent intensity in CFX 5
 
Greetings to all, The previous answer is not certain 100%. Due to the explained thing previously they can be the schemes (SIMPLE,SIMPLER, SIMPLEC, PISO) But with certain details. I hope that another people us of a good answer to near of solution scheme. Best regards, Jhonny

Neale August 28, 2002 10:09

Re: Solution Method & turbulent intensity in CFX 5
 
SIMPLE and its variants, as well as PISO are all segregated approaches. CFX-5 does not draw on these approaches at all and that *is* 100% certain. In fact, there is no option to use a segregated approach. I mentioned that the approach in CFX-5 has been discussed before in the CFX Forum:

http://www.cfd-online.com/Forum/cfx_...e.cgi?read=934

Neale

Jhonny August 28, 2002 12:12

Re: Solution Method & turbulent intensity in CFX 5
 
Hi,I follow without understanding the algorithm of solution???? Please search: www.gre.ac.uk/~physica/phy2.11/theory/sode11.htm see Momentum-pressure coupling. Best regards.


Jhonny August 28, 2002 12:16

Re: Solution Method & turbulent intensity in CFX 5
 
excuse me the web is wwww.gre.ac.uk/~physica/phy2.11/theory/node1.htm

Robin August 30, 2002 16:28

Re: Solution Method & turbulent intensity in CFX 5
 
Hi Jhonny,

As Neale pointed out, CFX-5 uses a coupled approach, not segregated. The SIMPLE and SIMPLEC algorithms are a means to account for pressure-velocity coupling between segregated equations.

SIMPLEC is an extension to SIMPLE developed at ASC (now part of CFX). For more on this see:

Van Doormaal, J.P.; Raithby, G.D.,"Enhancements of the SIMPLE Method for Predicting Incompressible Fluid Flows", Numerical Heat Transfer, Vol. 7, pp. 147-163, 1984.

This approach was later dropped in favor of solving for the coupled mass-momentum equations simultanously using a coupled algebraic multigrid approach. For a paper describing the approach, see the following pubished by ASC in 1988:

Hutchinson, B.R.; Galpin, P.F.; Raithby, G.D., "Application of Additive Correction Multigrid to the Coupled Fluid Flow Equations", Numerical Heat Transfer, Vol. 11, pp. 133-147, 1988.

Regards, Robin


amazdeh June 29, 2011 12:39

Quote:

Originally Posted by Robin
;64560
Hi Jhonny,

As Neale pointed out, CFX-5 uses a coupled approach, not segregated. The SIMPLE and SIMPLEC algorithms are a means to account for pressure-velocity coupling between segregated equations.

SIMPLEC is an extension to SIMPLE developed at ASC (now part of CFX). For more on this see:

Van Doormaal, J.P.; Raithby, G.D.,"Enhancements of the SIMPLE Method for Predicting Incompressible Fluid Flows", Numerical Heat Transfer, Vol. 7, pp. 147-163, 1984.

This approach was later dropped in favor of solving for the coupled mass-momentum equations simultanously using a coupled algebraic multigrid approach. For a paper describing the approach, see the following pubished by ASC in 1988:

Hutchinson, B.R.; Galpin, P.F.; Raithby, G.D., "Application of Additive Correction Multigrid to the Coupled Fluid Flow Equations", Numerical Heat Transfer, Vol. 11, pp. 133-147, 1988.

Regards, Robin

Hi Robin

I don't seem to be able to find this article-do u have it?-thanks


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