Total mass flow - CFD Post

James113 · July 31, 2011, 14:32

Hi,
I am using CFX to simulate the motion of fluid inside vibrating elastic pipe.
Currently, I am trying to use CFD-POST to calculate the total mass flow through the inlet.
I know how to calculate the total mass flow on each time step, but how can I sum it?

Thanks,
James

singer1812 · August 1, 2011, 10:45

Try using perl and powersyntax. The following is an example. Not tested and written in haste, but general idea.

# Load a transient file and read the time step list
> load filename=myFile.res
!$timestepList = getValue("DATA READER", "Timestep List");
!@timesteps = split(/, /, $timestepList );

# Print step number, time value and mass flow for each time step
! $sum = 0;
! open(FH,">myOut");
! foreach $ts ( @timesteps ) {
> load timestep=$ts
! $val = massFlow("Inlet");
! $sum=$sum+$val;
! $time = getValue( "DATA READER", "Current Timevalue");
! print FH "$ts $time $val $sum\n";
!close FH;
!}

James113 · August 8, 2011, 15:49

Thank you Singer. I will try that.

July 31, 2011, 14:32	Total mass flow - CFD Post	#1
James113 New Member James Join Date: Apr 2011 Posts: 13 Rep Power: 14	Hi, I am using CFX to simulate the motion of fluid inside vibrating elastic pipe. Currently, I am trying to use CFD-POST to calculate the total mass flow through the inlet. I know how to calculate the total mass flow on each time step, but how can I sum it? Thanks, James

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August 1, 2011, 10:45		#2
singer1812 Senior Member Edmund Singer P.E. Join Date: Aug 2010 Location: Minneapolis, MN Posts: 511 Rep Power: 20	Try using perl and powersyntax. The following is an example. Not tested and written in haste, but general idea. # Load a transient file and read the time step list > load filename=myFile.res !$timestepList = getValue("DATA READER", "Timestep List"); !@timesteps = split(/, /, $timestepList ); # Print step number, time value and mass flow for each time step ! $sum = 0; ! open(FH,">myOut"); ! foreach $ts ( @timesteps ) { > load timestep=$ts ! $val = massFlow("Inlet"); ! $sum=$sum+$val; ! $time = getValue( "DATA READER", "Current Timevalue"); ! print FH "$ts $time $val $sum\n"; !close FH; !}

August 8, 2011, 15:49		#3
James113 New Member James Join Date: Apr 2011 Posts: 13 Rep Power: 14	Thank you Singer. I will try that.