# Automatic post processing of Transient simulation

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 June 24, 2005, 04:47 Automatic post processing of Transient simulation #1 Aziz Guest   Posts: n/a Hello I have been trying to do some post processing calculation for my transient simulation. I have done this per hand very often but now i want it to be automatic so that i can use it for optimization process. My query is: I want to calculate the total energy at the inlet and outlet of the nozzle which is time dependent. I used to write density, pressure and velocity at the inlet and outlet by exporting the values from chart in CFX-Post and than in Excel i did further calculation to find the nozzle efficiency in transient flow. Any one know how can you use command editor in CFX-Post to store and calculate the sum of energy over time. Just for reference the equations are like that: Efficiency = Numerator / Denomenator Numerator = Sum((Pressure * Velocity * Area)@outlet*DeltaT)+Sum((0.5*density*Area*Velocit y^3)@outlet Denomerator = should be same as Numerator but calcualted for inlet thanks Aziz

 June 24, 2005, 12:34 Re: Automatic post processing of Transient simulat #2 Rui Guest   Posts: n/a Hi, Can't you do that with CEL expressions? What does Sum mean? Summation over the area, or over the time?What does DeltaT mean? Does T stand dor time or for temperature? Rui

 June 24, 2005, 14:37 Re: Automatic post processing of Transient simulat #3 TB Guest   Posts: n/a Refer to CEL user manual and then use PERL language for the programming syntax under command editor. It's pretty simple (I only spend one week to learn PERL and I can automate basically anything in Post now). There're quite some free references about PERL programming on Google. Cheers.