# Momentum Interpolation on Collocated grids

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 June 1, 2006, 17:30 Momentum Interpolation on Collocated grids #1 Naresh Guest   Posts: n/a Hello I have constructed a code that solves flow problems on collocated grids with momentum interpolation scheme for the face velocities. The code is working fine. However, at very low grid sizes, the solution is not there and I believe that the extra terms (added dissipation terms) in the momentuminterpolation is affecting the velocity profile. However, pressure checkerboarding is eliminated. In addition, the scheme seems to be working for larger grids. Any suggestions????

 June 1, 2006, 19:58 Re: Momentum Interpolation on Collocated grids #2 George Guest   Posts: n/a Hi, when you say that the solution is not there, what do you mean exactly? And how low grid size have you tried?

 June 1, 2006, 20:55 Re: Momentum Interpolation on Collocated grids #3 Naresh Guest   Posts: n/a Hi there What i try to mean is the establishment of fully developed flow near the exit.Beacuse, i impose fully developed flow for u and v velocities at the exit. I see this trend until grid sizes of 9 by 9- cartesian grid volumes. My intuitive understanding of this situation is that the added dissipation terms have an adverse effect- but i'm not sure!

 November 17, 2009, 09:30 colocated grid solver #4 Member   jk Join Date: Jun 2009 Posts: 64 Rep Power: 9 Hi Naresh, I have written a code using simple algorithm for incompressible flow using staggered grid. Now i am trying to write the same on the colocated grid. I have done as follows. Please check whether they are right. steps (i). solving for up and vp without pressure term from general discretized momentum equation (ii) Using the rho and chi's interpolation i am finding the face velocities For eg. (u velocity at the east face of point p) Ue = 0.5*(UP+UE) + (delv/4*ap*delx)*(PEE-3PE+3PP-PW) (iii). Substituting the value of Ue, Uw, Un and Us in the pressure correction equation. (iv) correcting the pressure and velocities Whether the above steps are right ? or do i need any change in that ? thanks jyo

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