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How to write a expression in fluent using 'if' condition?

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Old   December 16, 2021, 10:21
Angry How to write a expression in fluent using 'if' condition?
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I am doing a simulation of the converging nozzle, under-expanded jet impinging on a water layer over a flat plate.

At the inlet, I need to change the pressure gradually with flow time/iteration.

How can I write an expression for it?

Thanks
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expression editor, fluent - udf, if condition, udf code

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