# Can a non-staggered grid Method used here?

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 June 11, 2002, 07:20 Can a non-staggered grid Method used here? #1 lololo Guest   Posts: n/a Dear sir: I took pseudo-compressibility idea to process the continuity equation, Can I also used the non-staggered grid Method(By: Rhie C M ,Chow W L, 1983) now?

 June 12, 2002, 04:49 Re: Can a non-staggered grid Method used here? #2 versi Guest   Posts: n/a The pseudo-compressibility method is mostly implemented on non-staggered grid because the P and V are coupled ,the method is free of compatability constraint which is encountered in other Poisson type methods, and is flexiable in complex geometries.

 June 12, 2002, 07:16 Re: Can a non-staggered grid Method used here? #3 lololo Guest   Posts: n/a Sir: Thank you for your kind answers. Do you mean that we can use collocated arrangement for Vi and P taking no account for the oscillating pressure field which occur in SIMPLE Method? and, can I use the central diffence scheme for discretisation of the Pressue gradient item in this case?

 June 12, 2002, 21:00 Re: Can a non-staggered grid Method used here? #4 versi Guest   Posts: n/a Since you use artificial compresssiblity method, it is of hyperbolic type, and upwind scheme is preferable for all inviscid terms. A central scheme will lead to instability on collocated grid.

 June 13, 2002, 16:47 Re: Can a non-staggered grid Method used here? #5 Jim Park Guest   Posts: n/a You need to be sure that you mean "collocated" and not "colocated." Colocated means that the velocities and pressure are evaluated at the same point (as opposed to a "staggered" location scheme). Collocated is a mathematical term - I think (and will be corrected!) that it has to do with interpolation or as method to solve ODE's. From the context of your posts, you are probably talking about "colocated."

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