[Turbomachine]

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!!