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-   -   Power Used On moving Fluid (https://www.cfd-online.com/Forums/fluent/28946-power-used-moving-fluid.html)

 Amadou Sowe September 25, 2001 15:53

Power Used On moving Fluid

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?

 Lanre September 26, 2001 12:29

Re: Power Used On moving Fluid

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

 Amadou Sowe September 26, 2001 12:50

Re: Power Used On moving Fluid

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.

 Lanre September 26, 2001 13:44

Re: Power Used On moving Fluid

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

 Amadou Sowe September 26, 2001 14:03

Re: Power Used On moving Fluid

Thanks Lanre, I will pursue it.

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