I have a small rectangular duct and I have used Velocity inlet and pressure outlet boundary conditions for inlet and outlet, respectively. After calculations everything seems fine except for the pressure drop. I used Area weighted average to calculate total pressure at inlet and outlet and the results are 20 times lower than expected? What can cause such a problem?
Is the flow laminar and fully developed?
Are you talking about the absolute pressure or you difference also in the pressure gradient?
you should provide more details about your case.
The value of pressure drop calculated in Fluent may be lower than the expected value due to several reasons. Here are some possible reasons:
To identify the specific reason why the pressure drop calculated in Fluent is lower than the expected value, it is important to perform a thorough analysis of the simulation setup, including the boundary conditions, mesh resolution, material properties, and convergence criteria. It may also be helpful to compare the results with experimental data or other numerical simulations to validate the accuracy of the results.
Regenerate response.
I hope this helps.
Filippo Maria Denaro Thanks for your response. Yes my flow is fully developed laminar. And I am Looking for the difference in absolut Pressure drop. I guess I have to check the list given by Kristaq Hazizi (Also Thank you).
Wheather you need to modify your viscous model or not? For example, the standard k-e model does not always yield accurate results. Using Realizable and Enhanced Wall Treatment could improve the accuracy of results. In addition to this, boundary layer of fluid is crucial in pressure drop.
If you've already done so good luck in solving this dilemma soon.
Consider adding an additional length before the current inlet of the channel you are modeling to make sure the flow has the chance to reach complete hydraulic development. In other words, you should have two inlets, an imaginary one, far before the current inlet, and another one from which your hydraulically-developed flow should start.
The distance between the imaginary inlet and the current one allows the flow to be fully developed; however, that part should be disregarded during the calculation of the results, and it is added just to reach hydraulic development.
I hope this can be helpful in your case.
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