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Calculation of reaction force and moment in fluent

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Old   September 24, 2014, 01:25
Default Calculation of reaction force and moment in fluent
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Lee,Dong Beom
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Dear all,

I am simulating a hydrofoil using fluent.
I wanna calculate the reaction force and moment at the end of hydrofoil.
If I transfer the load from fluent to structural analysis using 1-way FSI, I can get the data.
However I am wondering there is no way to get the data without that kind of complex way.

Is it possible to know the coordinate of center of force in fluent?
or can I specify the axis of moment?

Any kind of comments or helps will be appreciated.
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Old   September 24, 2014, 10:24
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Andrew Kokemoor
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Fluent User's Guide 32.4.1. Generating a Force, Moment, or Center of Pressure Report should have everything you're looking for.
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Old   September 24, 2014, 22:05
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Lee,Dong Beom
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Quote:
Originally Posted by Kokemoor View Post
Fluent User's Guide 32.4.1. Generating a Force, Moment, or Center of Pressure Report should have everything you're looking for.
Dear Kokemoor,

Thank you for your reply. It is very helpful for my question.
However I have still some problem. My simulation is transient analysis and there is vertical motion of hydrofoil. so it is difficult to define moment center in GUI because it is always changing.
Could you give me some recommendation for the problem?
I guess UDF is one of the solution.
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Old   September 25, 2014, 10:24
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Andrew Kokemoor
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Given the force components and the moment at one point (and the acceleration of the center of gravity in a transient case) you can always manually calculate the moment about a different center; this is basic dynamics. I suggest reporting the moment about some reference point as well as the force components, then use Matlab/Excel/your program of choice to transform the reported moment to your point of interest.
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Old   September 28, 2014, 02:53
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Lee,Dong Beom
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Quote:
Originally Posted by Kokemoor View Post
Given the force components and the moment at one point (and the acceleration of the center of gravity in a transient case) you can always manually calculate the moment about a different center; this is basic dynamics. I suggest reporting the moment about some reference point as well as the force components, then use Matlab/Excel/your program of choice to transform the reported moment to your point of interest.
Thank you for your explanation.
Your comment would be very helpful for my research.

Have a good day~^^
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