Pressure coefficient in SIMPLE Algorithm

m.iran · August 20, 2009, 11:36

hi everybody
I have a question about calculating pressure-correction Eq's coefficients.
I don't know how could I determine that, should I determine them after correcting u* and use new u* for calculating aI,J or by using guessed velocity field?
thank you.

zobekenobe · August 21, 2009, 00:55

i use the colocated grid along with momentum interpolation ....so in that case when i am writing the cell face velocities ...they are the obtained by the linear interpolation of the cell centred velocities (the ones that were alredy predicted)...and hence in the pressure correction equations you have these cell face velocities that come into play.

hadian · August 22, 2009, 01:36

i use collocated grid and the calculation is :
1-solving u and v momentum and calculating u* and v*
2- calculating cell face velocities by momentum interpolation using calculated cell center u*, v* and cell face velocities of last iteration and time step.
3-solving pressure correction eq. (the cell face velocities calculated in step 2)
4- correcting cell center and cell face velocities

August 20, 2009, 11:36	Pressure coefficient in SIMPLE Algorithm	#1
m.iran New Member Mohammad Haddadi Join Date: Aug 2009 Location: Tehran,Iran Posts: 4 Rep Power: 0	hi everybody I have a question about calculating pressure-correction Eq's coefficients. I don't know how could I determine that, should I determine them after correcting u* and use new u* for calculating aI,J or by using guessed velocity field? thank you.

August 21, 2009, 00:55	hey	#2
zobekenobe Member zobekenobe Join Date: Mar 2009 Location: Dublin, Ireland Posts: 72 Rep Power: 17	i use the colocated grid along with momentum interpolation ....so in that case when i am writing the cell face velocities ...they are the obtained by the linear interpolation of the cell centred velocities (the ones that were alredy predicted)...and hence in the pressure correction equations you have these cell face velocities that come into play.

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August 22, 2009, 01:36		#3
hadian Member Mohammad Reza Hadian Join Date: Mar 2009 Location: Yazd, Iran Posts: 52 Rep Power: 17	i use collocated grid and the calculation is : 1-solving u and v momentum and calculating u* and v* 2- calculating cell face velocities by momentum interpolation using calculated cell center u, v and cell face velocities of last iteration and time step. 3-solving pressure correction eq. (the cell face velocities calculated in step 2) 4- correcting cell center and cell face velocities