# What is Density-Based method?

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 November 11, 1998, 10:20 What is Density-Based method? #1 C-H Kuo Guest   Posts: n/a This is a great place for post-school learning. I appreciate the large and diversified knowledge from this website. I have been working on CFD several years, and once a while I hear people talking about pressure-based and density-based solution methods. I really don't know what it is, could not find from literature, and felt shame to ask. I asked several times and did not get it. I think it is an ambiguous term or the person I asked is same as me--don't really know it. Could someone give a detailed description on this method, and the advantage and disadvantage of it. I will appreciate this, and I belive many out there will also appreciate it.

 November 11, 1998, 18:06 Re: What is Density-Based method? #3 jay Guest   Posts: n/a In the density based method, the algorithm uses a constitutive relation such as the ideal-gas law to iterate for the pressure. In the pressure based method, no constitutive relation is used; pressure is never even iterated for, only the pressure difference is calculated iteratively (in SIMPLE) That is the gist of the matter. For an explanation as to why: it has to do w/ the structure of the equations that describe compressible and incompressible flows. One is elliptic, another is parabolic (in basic form; I bet there are people out there who'll jump on me for saying this!) W.F Ames's book on Numerical Analysis is a good place to start to understand these math details. Someone below has suggested Fletcher for a beginners book. That also is a very good reference to understand this concept.

 November 18, 1998, 01:09 Re: What is Density-Based method? #4 Aldrin Wong Guest   Posts: n/a Where can I find more information regarding the "all-speed" method ? Is there a proper name for it ?

 November 18, 1998, 17:11 Re: What is Density-Based method? #5 Hongjun Li Guest   Posts: n/a I did some work in this area about 4-5 years ago. I need to dig out some papers from my files and come back to you later.

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