[LudoH]

Hi guys,

I’m using the cavity-3D case with a 3M cells mesh.

I’m currently having a performance issue while using 4.1 version.

Here is the output I got with 4.1.

Starting time loop

Time = 0.0001

Courant Number mean: 0 max: 0
smoothSolver: Solving for Ux, Initial residual = 1, Final residual = 1.68989e-06, No Iterations 3
smoothSolver: Solving for Uy, Initial residual = 0, Final residual = 0, No Iterations 0
smoothSolver: Solving for Uz, Initial residual = 0, Final residual = 0, No Iterations 0
DICPCG: Solving for p, Initial residual = 1, Final residual = 0.0477591, No Iterations 153
time step continuity errors : sum local = 2.75823e-08, global = 1.4455e-23, cumulative = 1.4455e-23
DICPCG: Solving for p, Initial residual = 0.0857006, Final residual = 9.88484e-07, No Iterations 528
time step continuity errors : sum local = 1.13433e-12, global = 6.91952e-24, cumulative = 2.13745e-23
ExecutionTime = 4.56 s ClockTime = 4 s

While I got the following with 3.0.1:

Time = 0.0001

Courant Number mean: 0 max: 0
smoothSolver: Solving for Ux, Initial residual = 1, Final residual = 1.68989e-06, No Iterations 3
smoothSolver: Solving for Uy, Initial residual = 0, Final residual = 0, No Iterations 0
smoothSolver: Solving for Uz, Initial residual = 0, Final residual = 0, No Iterations 0
DICPCG: Solving for p, Initial residual = 1, Final residual = 0.0477591, No Iterations 153
time step continuity errors : sum local = 2.75823e-08, global = -1.14771e-23, cumulative = -1.14771e-23
DICPCG: Solving for p, Initial residual = 0.0857006, Final residual = 0.00406192, No Iterations 149
time step continuity errors : sum local = 4.79613e-09, global = 9.74005e-24, cumulative = -1.73708e-24
ExecutionTime = 2.59 s ClockTime = 6 s

Does anyone know why It would take twice the number of iteration to make the same step in 4.1 than in 3.0.1 ?

Thanks in advance,

Ludo