# Calculation of reaction force and moment in fluent

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 September 24, 2014, 01:25 Calculation of reaction force and moment in fluent #1 New Member   Lee,Dong Beom Join Date: Apr 2013 Posts: 21 Rep Power: 5 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.

 September 24, 2014, 10:24 #2 Senior Member   Andrew Kokemoor Join Date: Aug 2013 Posts: 121 Rep Power: 6 Fluent User's Guide 32.4.1. Generating a Force, Moment, or Center of Pressure Report should have everything you're looking for.

September 24, 2014, 22:05
#3
New Member

Lee,Dong Beom
Join Date: Apr 2013
Posts: 21
Rep Power: 5
Quote:
 Originally Posted by Kokemoor 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,

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.

 September 25, 2014, 10:24 #4 Senior Member   Andrew Kokemoor Join Date: Aug 2013 Posts: 121 Rep Power: 6 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.

September 28, 2014, 02:53
#5
New Member

Lee,Dong Beom
Join Date: Apr 2013
Posts: 21
Rep Power: 5
Quote:
 Originally Posted by Kokemoor 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.

Have a good day~^^

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