# Power Used On moving Fluid

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 September 25, 2001, 15:53 Power Used On moving Fluid #1 Amadou Sowe Guest   Posts: n/a Fluent 5 post processing matter: I am trying to compute the power used by a vibrating plate on moving the fluid above it using fluent 5. One approach I have is to integrate an appropriate custom field function using surface integrals under the reports menu. Does any one have a better way or an improvement to my idea?

 September 26, 2001, 12:29 Re: Power Used On moving Fluid #2 Lanre Guest   Posts: n/a Hi Amadou, Either a CFF or a UDF utilizing the execute on demand macro would work. The latter approach with the UDF would give you more flexibility particularly if the plate is non-planar and you can also write the function to user-defined memory so that you can display contours of the power on the plate. A simple alternative would be to use the Report->Forces... panel to compute the force on the plate and then hand- calc to power. Cheers, Lanre

 September 26, 2001, 12:50 Re: Power Used On moving Fluid #3 Amadou Sowe Guest   Posts: n/a Hi Lanre, Thanks for your input. The force on the plate is not constant so the last option (Report-->Forces) is not as applicable as the first two. The CFF approach is the one I am using currently. However, your second approach would be really good to do since I can plot contours of power on the plate. Unfortunately, I am not familiar with this approach. I will be more than glad to know the specifics on using a UDF to achieve this task.

 September 26, 2001, 13:44 Re: Power Used On moving Fluid #4 Lanre Guest   Posts: n/a Hi Amadou, This example walks you through the basics of my second suggestion: http://www.fluentusers.com/fluent5/d...ml/node108.htm You'll need to compute the shear stress on the plate (wall) zone to use in the power calculation. Cheers, Lanre

 September 26, 2001, 14:03 Re: Power Used On moving Fluid #5 Amadou Sowe Guest   Posts: n/a Thanks Lanre, I will pursue it.

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