I am working on enhancement of heat transfer in a square channel through broken ribs. I need to calculate friction factor f so I need pressure drop across the periodic duct. I am using FLUENT 6.3.26 for simulation with periodic and symmetric conditions. The upper and lower walls are heated walls where constant heat flux of 2500 W/m2 is applied and other two walls are adiabatic, and adiabatic ribs were provided on heated walls. I am using the k-ep turbulence model. Is there any other method to calculate friction factor in this case?
You may follow my earlier post about the same query here is the link
https://www.researchgate.net/post/Pressure_Drop_in_Fluent-can_anyone_help
I hope your problem will solve.
As well as i give you the one suggestion that will help you.that's when i went through programming manual of fluent code i got this details.
Fluent “solves” the flow equations to within a certain tolerance – the default value of the residual is up to 0.01.
Suppose,as a example if you are solving for the pressure drop across a vessel where the entrance pressure is 1000 Pa, Fluent will consider the problem “solved” when the exit pressure is calculated to within +/- 10 Pa (10 Pa / 1000 Pa = 0.01). However, if the total pressure drop across your vessel is supposed to be 20 Pa, note that Fluent will only be able to calculate the pressure drop to within 50%, i.e., to 20 Pa +/- 10 Pa. Although you can “fix” this problem by lowering the tolerance (say, to 0.001)but this will dramatically increase the computation time.
@Shrish Shukla, Dear Shukla, please carefully go through the question. Its a periodic domain..
Dear Anuj Kumar Shukla
I am also using periodic boundary condition. Actually, I can not measure the pressure drop by using this method. Because, The pressure drop should become input. How come we get pressure drop but we need pressure drop input. Have you already get the pressure drop for this BC?
Thank you
Best Regards
- Badges
- Science topic