I ran cavity case 200x200 both
 

I ran cavity case 200x200 both with version 1.1 and 1.2 32 bit,
version 1.2 took 2237 s while,
version 1.1 took 1322 s

version 1.2 was 0.6 times slower than 1.1. I checked the solver output at Time = 0.33, version 1.2 is taking much more iterations to reach the the solution compared to 1.1. I then cheched the case description in both versions, there was one difference in system/fvSolution dictionary:

PISO
{
nCorrectors 2;
nNonOrthogonalCorrectors 0;
pRefCell 0;
pRefValue 0;
}

the last two line in the PISO dictionary has been added in 1.2. I also noticed some small changes that has been done in icoFoam.C solver (is it just a syntax change). Can any body explain what is the reason behind the speed difference. Here is some output. Thanks!

------------------------------------
version 1.2
-------------------------------------
Time = 0.33

Mean and max Courant Numbers = 0.113538 0.985332
ICCG: Solving for p, Initial residual = 1.1225e-06, Final residual = 9.13572e-07, No Iterations 48
time step continuity errors : sum local = 8.49873e-11, global = -9.80646e-20, cumulative = 4.47845e-18
ICCG: Solving for p, Initial residual = 1.74346e-06, Final residual = 9.19236e-07, No Iterations 49
time step continuity errors : sum local = 8.649e-11, global = 2.55935e-20, cumulative = 4.50405e-18
ExecutionTime = 2123.82 s

---------------------------------
version 1.1
---------------------------------
Time = 0.33

Max Courant Number = 0.985328
ICCG: Solving for p, Initial residual = 1.1782e-06, Final residual = 9.46485e-07, No Iterations 1
time step continuity errors : sum local = 8.90883e-11, global = 1.01824e-19, cumulative = -3.82427e-18
ICCG: Solving for p, Initial residual = 1.19506e-06, Final residual = 8.92651e-07, No Iterations 7
time step continuity errors : sum local = 8.43076e-11, global = -1.2003e-19, cumulative = -3.9443e-18
ExecutionTime = 1190.61 s



Regards,
Maka

Hi Maka: have you solved yo
 

Hi Maka:

have you solved you problem?
I encounter the same question. Could you please help me?

Thanks a lot.
Guoxiang

It seems that there is somethi
 

It seems that there is something that we do not know, that is why no body answered the question. If you managed to know why, I will be grateful if you share the knowledge.

best regards,
Maka