How to creates a serie of iso-clips in CFDpost in order to cut a surface by equal angular sectors?
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Assumption: 1-The axis is Z axis. 2- Each angular sectors have the same size. Note: Theta function uses atan2(x,y) function. Due to smoothing of atan2(x,y) function discontinuity (-180°/+180°) , the created surface with iso-clip may include a very small surface in the area close to the discontinuity (close to +180° of angle Theta). For example, if you want to clip your surface between 0 and 45° you may have include a small part that comes from the smoothing between -180 and + 180°. An additional test on postive X or postive Y is added to avoid this artifact in the script. How to run it?: In CFD post read the following PERL script via Session-->Play Session. SCRIPT: #enter name of the surface to split with angles. !$name="FLOW_OUTFLOW"; # enter the number of angular sectors. !$numsteps=7; LIBRARY: CEL: EXPRESSIONS: theta1 = atan2(y,x) theta2 = atan2(-x,y) END END END USER SCALAR VARIABLE: Theta 1 Boundary Values = Conservative Calculate Global Range = Off Expression = theta1 Recipe = Expression END USER SCALAR VARIABLE: Theta 2 Boundary Values = Conservative Calculate Global Range = Off Expression = theta2 Recipe = Expression END ! for ($i=0;$i<$numsteps;$i++) !{ !$dangle=360/$numsteps; !$num0=$i*$dangle; !$num1=($i+1)*$dangle; ! if ($num1<180.0) !{ ISO CLIP: Iso Clip $i Location List = $name ISO CLIP LIMITER: Iso Clip Limiter 1 Limiter Operation = Greater Or Equal To Value = $num0 [degree]-90 [degree] Variable = Theta 2 Variable Boundary Values = Conservative END ISO CLIP LIMITER: Iso Clip Limiter 2 Limiter Operation = Less Or Equal To Value = $num1 [degree]-90 [degree] Variable = Theta 2 Variable Boundary Values = Conservative END ISO CLIP LIMITER: Iso Clip Limiter 3 Limiter Operation = Greater Or Equal To Value = 0 [m] Variable = Y Variable Boundary Values = Hybrid END END ! } ! else !{ !if ($num0<180.0) ! { ISO CLIP: Iso Clip $i Location List = $name ISO CLIP LIMITER: Iso Clip Limiter 1 Limiter Operation = Greater Or Equal To Value = $num0 [degree]-90 [degree] Variable = Theta 2 Variable Boundary Values = Conservative END ISO CLIP LIMITER: Iso Clip Limiter 2 Limiter Operation = Less Or Equal To Value = $num1 [degree]-90 [degree] Variable = Theta 2 Variable Boundary Values = Conservative END ISO CLIP LIMITER: Iso Clip Limiter 3 Limiter Operation = Less Or Equal To Value = 0 [m] Variable = X Variable Boundary Values = Hybrid END END !} else !{ ISO CLIP: Iso Clip $i Location List = $name ISO CLIP LIMITER: Iso Clip Limiter 1 Limiter Operation = Greater Or Equal To Value = $num0 [degree]-360 [degree] Variable = Theta 1 Variable Boundary Values = Conservative END ISO CLIP LIMITER: Iso Clip Limiter 2 Limiter Operation = Less Or Equal To Value = $num1 [degree]-360 [degree] Variable = Theta 1 Variable Boundary Values = Conservative END ISO CLIP LIMITER: Iso Clip Limiter 3 Limiter Operation = Less Or Equal To Value = 0 [m] Variable = Y Variable Boundary Values = Hybrid END END !} !} !} |
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