# Change foamLog for Pimple iteration and new variables

 Register Blogs Members List Search Today's Posts Mark Forums Read April 25, 2019, 09:16 Change foamLog for Pimple iteration and new variables #1 Member   Ilan Join Date: Dec 2018 Posts: 32 Rep Power: 3 Dear Foamers, I need a little help for my post-processing : I use a solid solver to compute a rotation. For each time step, pimple loop is called several times. In each loop, the variable I need to plot (Angular velocity) through time is calculated. I need to extract my angular velocity against time. I just need the last value for each time step. I already used one of the solutions posted on CFD online that used the grep function. But it gives me all the values of the angular velocity independently of the time step. Then I though i should use foamLog to do that. But 1) the function is not really good working when pimple do more than 1 iteration (create a new file for each variable at a certain number of iteration). 2) It is complicated for me to add a new variable in the code. In short, I need a file with 2 colomns : Time step/Last angular velocity of the time step For this type of file : Code: ```Starting time loop Courant Number mean: 2.8755e-06 max: 0.000106375 deltaT = 5.9988e-06 Time = 5.9988e-06 PIMPLE: Iteration 1 forces forces: Not including porosity effects 6-DoF rigid body motion Centre of rotation: (8.05317e-08 -1.02214e-07 1.49884e-18) Centre of mass: (8.05317e-08 -1.02214e-07 1.49884e-18) Orientation: (0.710317 -0.703881 -2.09457e-16 0.703881 0.710317 -1.1383e-15 9.50012e-16 6.61124e-16 1) Linear velocity: (0 0 0) Angular velocity: (0 0 0) AMI: Creating addressing and weights between 10320 source faces and 10488 target faces AMI: Patch source sum(weights) min/max/average = 0.988487, 1.34623, 1.0066 AMI: Patch target sum(weights) min/max/average = 0.371348, 1.06694, 0.998123 GAMG: Solving for pcorr, Initial residual = 1, Final residual = 0.00954092, No Iterations 5 GAMG: Solving for pcorr, Initial residual = 0.0082744, Final residual = 0.0082744, No Iterations 0 time step continuity errors : sum local = 6.46058e-06, global = -1.50885e-09, cumulative = -1.50885e-09 smoothSolver: Solving for Ux, Initial residual = 1, Final residual = 3.73148e-11, No Iterations 1 smoothSolver: Solving for Uy, Initial residual = 1, Final residual = 5.38785e-06, No Iterations 1 smoothSolver: Solving for Uz, Initial residual = 0.999958, Final residual = 9.5898e-06, No Iterations 1 GAMG: Solving for p, Initial residual = 1, Final residual = 0.00993448, No Iterations 5 GAMG: Solving for p, Initial residual = 0.00830228, Final residual = 3.63498e-07, No Iterations 6 time step continuity errors : sum local = 3.62129e-14, global = -1.00253e-14, cumulative = -1.50886e-09 PIMPLE: Iteration 2 forces forces: Not including porosity effects 6-DoF rigid body motion Centre of rotation: (8.05317e-08 -1.02214e-07 1.49884e-18) Centre of mass: (8.05317e-08 -1.02214e-07 1.49884e-18) Orientation: (0.710317 -0.703881 -2.09457e-16 0.703881 0.710317 -1.1383e-15 9.50012e-16 6.61124e-16 1) Linear velocity: (0 0 0) Angular velocity: (-8.46769e-23 -4.6018e-22 4.04268e-07) AMI: Creating addressing and weights between 10320 source faces and 10488 target faces AMI: Patch source sum(weights) min/max/average = 0.988487, 1.34623, 1.0066 AMI: Patch target sum(weights) min/max/average = 0.371348, 1.06694, 0.998123 GAMG: Solving for pcorr, Initial residual = 1, Final residual = 0.00949575, No Iterations 5 GAMG: Solving for pcorr, Initial residual = 0.00827485, Final residual = 0.00827485, No Iterations 0 time step continuity errors : sum local = 6.4601e-06, global = -1.53028e-09, cumulative = -3.03913e-09 smoothSolver: Solving for Ux, Initial residual = 0.797393, Final residual = 1.90207e-06, No Iterations 1 smoothSolver: Solving for Uy, Initial residual = 0.177599, Final residual = 7.16774e-06, No Iterations 1 smoothSolver: Solving for Uz, Initial residual = 0.193548, Final residual = 4.67921e-06, No Iterations 1 GAMG: Solving for p, Initial residual = 0.00855496, Final residual = 3.27126e-05, No Iterations 4 GAMG: Solving for p, Initial residual = 0.00194473, Final residual = 4.22478e-07, No Iterations 5 time step continuity errors : sum local = 4.88858e-14, global = 3.29588e-16, cumulative = -3.03913e-09 . . . PIMPLE: Iteration 22 forces forces: Not including porosity effects 6-DoF rigid body motion Centre of rotation: (8.05317e-08 -1.02214e-07 1.49884e-18) Centre of mass: (8.05317e-08 -1.02214e-07 1.49884e-18) Orientation: (0.710317 -0.703881 -2.09457e-16 0.703881 0.710317 -1.1383e-15 9.50012e-16 6.61124e-16 1) Linear velocity: (0 0 0) Angular velocity: (-7.35178e-23 -3.99535e-22 3.50992e-07) AMI: Creating addressing and weights between 10320 source faces and 10488 target faces AMI: Patch source sum(weights) min/max/average = 0.988487, 1.34623, 1.0066 AMI: Patch target sum(weights) min/max/average = 0.371348, 1.06694, 0.998123 GAMG: Solving for pcorr, Initial residual = 1, Final residual = 0.00960231, No Iterations 5 GAMG: Solving for pcorr, Initial residual = 0.00827486, Final residual = 0.00827486, No Iterations 0 time step continuity errors : sum local = 6.45894e-06, global = -1.51682e-09, cumulative = -3.38869e-08 smoothSolver: Solving for Ux, Initial residual = 3.51142e-06, Final residual = 7.51302e-12, No Iterations 1 smoothSolver: Solving for Uy, Initial residual = 1.77977e-07, Final residual = 1.77977e-07, No Iterations 0 smoothSolver: Solving for Uz, Initial residual = 3.29433e-07, Final residual = 3.29433e-07, No Iterations 0 GAMG: Solving for p, Initial residual = 2.31852e-07, Final residual = 2.31852e-07, No Iterations 0 GAMG: Solving for p, Initial residual = 2.31852e-07, Final residual = 2.31852e-07, No Iterations 0 time step continuity errors : sum local = 2.83004e-14, global = -9.88155e-16, cumulative = -3.38869e-08 PIMPLE: Converged in 22 iterations ExecutionTime = 67.58 s ClockTime = 68 s Courant Number mean: 1.67388e-07 max: 2.82459e-05 deltaT = 7.19511e-06 Time = 1.31939e-05 PIMPLE: Iteration 1 forces forces: Not including porosity effects 6-DoF rigid body motion Centre of rotation: (8.05317e-08 -1.02214e-07 1.49884e-18) Centre of mass: (8.05317e-08 -1.02214e-07 1.49884e-18) Orientation: (0.710317 -0.703881 -2.09457e-16 0.703881 0.710317 -1.1383e-15 9.50012e-16 6.61124e-16 1) Linear velocity: (0 0 0) Angular velocity: (-2.49876e-22 -1.35796e-21 1.19297e-06) AMI: Creating addressing and weights between 10320 source faces and 10488 target faces AMI: Patch source sum(weights) min/max/average = 0.988487, 1.34623, 1.0066 AMI: Patch target sum(weights) min/max/average = 0.371348, 1.06694, 0.998123 GAMG: Solving for pcorr, Initial residual = 1, Final residual = 0.00944155, No Iterations 5 GAMG: Solving for pcorr, Initial residual = 0.00827466, Final residual = 0.00827466, No Iterations 0 time step continuity errors : sum local = 7.74685e-06, global = -1.88339e-09, cumulative = -3.57703e-08 smoothSolver: Solving for Ux, Initial residual = 0.855398, Final residual = 2.31223e-06, No Iterations 1 smoothSolver: Solving for Uy, Initial residual = 0.208584, Final residual = 6.76758e-06, No Iterations 1 smoothSolver: Solving for Uz, Initial residual = 0.226375, Final residual = 6.68791e-06, No Iterations 1 GAMG: Solving for p, Initial residual = 0.00386014, Final residual = 2.49145e-05, No Iterations 4 GAMG: Solving for p, Initial residual = 0.00107462, Final residual = 6.67368e-07, No Iterations 4 time step continuity errors : sum local = 1.29317e-13, global = -1.04586e-14, cumulative = -3.57703e-08 PIMPLE: Iteration 2 . . .``` Do you have any idea how to do this ? Thanks guys ! Happy Foam   April 26, 2019, 04:26 #2
Member

Ilan
Join Date: Dec 2018
Posts: 32
Rep Power: 3 Hello, I found a solution : for any data extraction from OpenFoam logs, you can use this small awk script I wrote :
Quote:
 /Time = /{gsub(")","",\$3); if (\$1=="Time" && f=="") print \$3,0; if (\$1=="Time" && f!="") print \$3,f} /Angular velocity:/{gsub(")","",\$5);{f=\$5}}
First line prints time steps and f.
f is the variable saved in line. It match the data you need to extract (for me, z angular velocity).  Tags foamlog, post processing Thread Tools Search this Thread Show Printable Version Email this Page Search this Thread: Advanced Search Display Modes Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are Off Pingbacks are On Refbacks are On Forum Rules

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