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May 3, 2019, 00:02 |
turbine force_y vs dP * area
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#1 |
Senior Member
Svetlana Tkachenko
Join Date: Oct 2013
Location: Australia, Sydney
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In ansys 19.2 the built in function
force_y()@turbine Default and a similar manual calculation (here 'top' and 'bottom' are circular surfaces below and above the turbine) (areaAve(Pressure)@bottom - areaAve(Pressure)@top ) * area()@top give different results 2-3 times, inconsistently in different cases as it is not a linear relationship. Is this a known issue? How do I troubleshoot this? Can attach a small test case if anyone is interested. |
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May 3, 2019, 02:26 |
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#2 |
Super Moderator
Glenn Horrocks
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Location: Sydney, Australia
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your areaAve functions just average the pressure over the surface, they do not take into account direction. The force_y function only gets the force in the y direction. So your function is not working out the force in the y direction.
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May 3, 2019, 02:31 |
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#3 |
Senior Member
Svetlana Tkachenko
Join Date: Oct 2013
Location: Australia, Sydney
Posts: 415
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In this case my calculations should give larger values than CFX's force_y,
because they do not multiply by cos (direction angle) in each point. However in my case the "dP * area" calculation gives results which are 0.3 to 0.7 of the force_y value predicted by CFX. |
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May 3, 2019, 02:34 |
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#4 |
Super Moderator
Glenn Horrocks
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If you want us to help you, you are going to have to post an image of what you are analysing, a description of what the top and bottom surfaces are and a plot of the pressure distribution.
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Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum. |
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Tags |
lift and drag, post procesing, propeller, turbine |
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