# Staggered Vs Collocated grid

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 June 15, 2007, 10:23 Staggered Vs Collocated grid #1 Sas Guest   Posts: n/a Dear all, Is it possible to use QUICKEST schemme for advection on collocated grid ? Have you ever been used that on any non-staggered grid? I am having problems of mass conservation if I use this scheme on collocated grid. Any help will be highly appreciated. Thank you !! Sas

 June 15, 2007, 10:38 Re: Staggered Vs Collocated grid #2 jinwon Guest   Posts: n/a Based on my experiences, I can remind that the collocated grids is primarily used in the compressible flow. On the other hand, most incompressible flow is discretized by a staggered grid.

 June 15, 2007, 11:20 Re: Staggered Vs Collocated grid #3 Sas Guest   Posts: n/a Thank you for the response. But I asked about the scheme. I am taking about Advection terms, which I plan to solve using QUICKEST method. So I wanted to know if someone has ever used QUICKEST scheme on collocated grid? I try to use that on collocated, but there was a problem of mass conservation.

 June 15, 2007, 11:25 Re: Staggered Vs Collocated grid #4 otd Guest   Posts: n/a Rhie and Chow (1983, AIAA J. 21, 1525) They use both staggered and colocated, interpolating as needed. Used widely since its publication.

 June 17, 2007, 11:19 Re: Staggered Vs Collocated grid #5 ds Guest   Posts: n/a ya you can apply quick scheme on collocated grid , for mass conservation you should use Rhie and Chow realtion to find the face velocities as suggested by otd.

 June 21, 2007, 07:04 Re: Staggered Vs Collocated grid #6 skg Guest   Posts: n/a I have used QUICK in case of collocated grid for discretization of advection terms. I have also used QUICK in case of staggered grid in cylindrical coordinate system. Regarding this you can consult the book of "Ferziger & Peric". But, I was unable to use the QUICK scheme in unstructured i.e. triangular grid. Can any one give any idea or any paper of implementation of QUICK in case of unstructured grid? Thanks.

 June 21, 2007, 10:34 Re: Staggered Vs Collocated grid #7 Sas Guest   Posts: n/a Dear Skg, I wonder in collocated grid all the varibales are at ONE point/node. But in QUICK, we need to calculate flux at the sides of the element/cell. For example, we can take concentration in the centre and velocity on the sides of the cell and then we can calculate flux. But if we take concentration as well velocities in the centre of the cell, the Did you encountered mass conservation error. Please eloborate.. Thanks.. Sas

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