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December 15, 2011, 04:45 |
relative velocity for a radial turbine wheel
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#1 |
Member
Niklas Winkler
Join Date: Mar 2009
Location: Stockholm, Stockholm, Sweden
Posts: 73
Rep Power: 17 |
Hi all,
I have a set of transient data for a radial turbine including the event file (.evn) and would like to compute the relative velocities in the wheel. The wheel rotation is simulated with the sliding mesh technique. Could anyone please give me a hint of how to or point me to a relevant tutorial. Thanks /NW |
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December 15, 2011, 07:20 |
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#2 |
Senior Member
Joern Beilke
Join Date: Mar 2009
Location: Dresden
Posts: 498
Rep Power: 20 |
Use the "reframe" command.
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December 15, 2011, 07:24 |
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#3 |
Member
Niklas Winkler
Join Date: Mar 2009
Location: Stockholm, Stockholm, Sweden
Posts: 73
Rep Power: 17 |
Thanks for your quick reply!
I've tried the following, reframe,2,local,(OMEGA), used the second coordinate system with the following command, csys,2 and then tried to extract the data again. However, it subtracts the data from the entire field and not just from the wheel. Do you know how I can specify a part of the field to get relative velocities at the wheel only? All the Best /NW |
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December 15, 2011, 08:48 |
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#4 |
Senior Member
Joern Beilke
Join Date: Mar 2009
Location: Dresden
Posts: 498
Rep Power: 20 |
There are 3 possibilities for using the command.
I don't see an easy solution for the other problem right now. |
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December 15, 2011, 11:54 |
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#5 |
Senior Member
Robert
Join Date: Jun 2010
Posts: 117
Rep Power: 16 |
I would think that you should be able to get there from here with OPERATE and CHANGE
If you use PSYS to set the basic system for post processing Then you can Getc,all to get the vectors in the axis of the rotor Oper getc x axis_syst 5 Oper smult omega 5 5 Cset news all non rotating cells change cset 0 0 0.0 0.0 5 oper subt 2 5 2 Oper unrotate Not sure if this does exactly what you want but some combination of the above commands or similar should get you there from here |
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December 22, 2011, 10:33 |
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#6 |
Member
Niklas Winkler
Join Date: Mar 2009
Location: Stockholm, Stockholm, Sweden
Posts: 73
Rep Power: 17 |
Thank you! The command oper,refr,local,(coord syst),(omega) did the trick!
All the Best /NW |
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