# Transient post-processing, Time averaged pressure work

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 January 2, 2011, 18:40 Transient post-processing, Time averaged pressure work #1 Member   Join Date: Aug 2010 Posts: 31 Rep Power: 8 Dear All, I am currently doing the post processing of a transient turbine analysis. I was looking at the previous posts and realised that there were several similar problems that have been raised but remained unsolved. Firstly, the description of the problem is the following: I have to calculate the work done by the pressure forces on the blade during its movement. Mathematically speaking I need to integrate pressure * mesh displacement over one cycle (100 timesteps) and then plot the work distribution. In previous discussions the following solutions have been proposed: 1) POWER SYNTAX in CFX-Post: ! @myTimeSteps = ("71","105","136"); # add your "solver steps" between brackets as they are listed in POST "Time Selector" ! \$MyVariable = "Water.Superficial Velocity"; # put the variable of interset between quotes ! \$MyPlane = "Plane zx"; # put the plane name here ! open(MyOutF,">C:/TimeAvgOut.csv") || die "Can't open file \$!\n"; # this will create a Report file named "TimeAvgOut.csv" on root of C:\ drive ! \$TStepsNo = @myTimeSteps; !print MyOutF "Time step , ",\$MyVariable, "\n"; ! for (\$i=0;\$i<\$TStepsNo;\$i++){ > load timestep= \$myTimeSteps[\$i] ! \$MyAvgVel = areaAve(\$MyVariable, \$MyPlane,""); !print MyOutF \$myTimeSteps[\$i]," , ",\$MyAvgVel, "\n"; !} ! close MyOutF; The above syntax calculates the area averaged work value at each timestep and stores it in a file. 2) TRANSIENT STATISTICS in CFX-Pre By setting transient statistics in CFX-Pre it is possible to obtain the time averaged output of variables, however I am not aware of the possibility to include mathematical operators such as p*displ. Despite the first option what I need is to plot the time averaged work distribution over selected timesteps. Can anyone suggest a way to achieve this? Thank you for your help!!

 Tags post-processing, pressure, time average, time averaged, transient

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