Ploting Torque data using CFX pre

our.salah11 · May 3, 2014, 15:08

Hello everyone
this is a video of a simulation i did , its a flow through rotating butterfly valve disc https://www.youtube.com/watch?v=6oG_...&feature=share
the probleme is that i was to plot the torque data but i didn't manage to; if anyone could please help me ; the torque i want to plot is the hydrodynamic torque on the video .
regards

ghorrocks · May 4, 2014, 09:39

The best way is to put a monitor point (set to the expression torquex/y/z()@valve) in at CFX-Pre and rerun the simulation. Then you get the torque history at full resolution.

But if you do not want to rerun the simulation you have the extract it from the post processor. Use the function calculator in CFD-Post to calculate the torque. Do this for all time steps you saved results files with enough data to generate the force information.

our.salah11 · May 7, 2014, 10:57

thnx a lot , i found a solution my self , its simple , insert new chart , XY transient or sequence , but u need to define variables of the data u want to plot , in my case torque and pressure plot , it took some time to generate the data files and to use them but it was worth the trouble , thnx

Spinassien · July 22, 2014, 06:31

Hello Professionals,
i am simulating a chinese windmill with several sails (as you can see in the picture i attached, flow direction is y). I am doing a mesh indipendence study and want to compare the torque of every sail in different cases. I use the calculator to calculate the torque. It takes a lot of time to use the calculator one by one by clicking with the mouse on the buttons. I want to calculate the torque of all sails about the z axis by one. how can i create a output like that?

ghorrocks · July 22, 2014, 06:55

You could define all the blades as a single wall boundary and then a single call of torque() would get the total number.

Or you could define a CEL variable:
TotalTorque = torque()@blade1+torque()@blade2+....+torque()@blad e[n]
either in CFD-Post or as a monitor point during solving.

Or in CFD-Post you could define a surface group which includes all the blades and use the function calculator to calculate the torque of the whole group.

Spinassien · July 22, 2014, 08:30

Thank you Mr. Horroks, it worked well.

May 3, 2014, 15:08	Ploting Torque data using CFX pre	#1
our.salah11 New Member our salaheddine Join Date: May 2014 Posts: 2 Rep Power: 0	Hello everyone this is a video of a simulation i did , its a flow through rotating butterfly valve disc https://www.youtube.com/watch?v=6oG_...&feature=share the probleme is that i was to plot the torque data but i didn't manage to; if anyone could please help me ; the torque i want to plot is the hydrodynamic torque on the video . regards

May 7, 2014, 10:57	thnx	#3
our.salah11 New Member our salaheddine Join Date: May 2014 Posts: 2 Rep Power: 0	thnx a lot , i found a solution my self , its simple , insert new chart , XY transient or sequence , but u need to define variables of the data u want to plot , in my case torque and pressure plot , it took some time to generate the data files and to use them but it was worth the trouble , thnx

July 22, 2014, 08:30	Thank You	#6
Spinassien New Member Cedric Join Date: Jul 2014 Posts: 9 Rep Power: 12	Thank you Mr. Horroks, it worked well.

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May 4, 2014, 09:39		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,870 Rep Power: 144	The best way is to put a monitor point (set to the expression torquex/y/z()@valve) in at CFX-Pre and rerun the simulation. Then you get the torque history at full resolution. But if you do not want to rerun the simulation you have the extract it from the post processor. Use the function calculator in CFD-Post to calculate the torque. Do this for all time steps you saved results files with enough data to generate the force information.

July 22, 2014, 06:55		#5
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,870 Rep Power: 144	You could define all the blades as a single wall boundary and then a single call of torque() would get the total number. Or you could define a CEL variable: TotalTorque = torque()@blade1+torque()@blade2+....+torque()@blad e[n] either in CFD-Post or as a monitor point during solving. Or in CFD-Post you could define a surface group which includes all the blades and use the function calculator to calculate the torque of the whole group.