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-   -   Can periodic function reduce the time and cost? (http://www.cfd-online.com/Forums/fluent/32653-can-periodic-function-reduce-time-cost.html)

Lam December 5, 2003 09:44

Can periodic function reduce the time and cost?
 
I am modelling a ship propeller now. It is a 3-blade propeller. I am confusing with the ability of periodic function in Fluent. What is the difference on computer power requirement between: I model all the three blades and run in Fluent, and I model one blade and turn on periodic function then run in Fluent. Is the second way less time and cost-consuming?

mateus December 5, 2003 11:35

Re: Can periodic function reduce the time and cost
 
Hi!

It's normal to work with periodib bc in cases like that. Since you have less cells (3 times less in your case) the cpu time will be considaraby smaller.

Regards MATEUS

ap December 5, 2003 13:12

Re: Can periodic function reduce the time and cost
 
Using periodic condition is a good idea in your case mainly for two reasons:

1) You reduce the complexity of the grid. So it's easier to create your mesh.

2) You reduce computational because, as said by mateus, you have less cell.

Hi :)

ap

Lam December 8, 2003 13:24

Re: Can periodic function reduce the time and cost
 
Thanks. I rotate the propeller using the sliding mesh method. After a few rotations till the efflux established, I retrieve the velocities of the efflux plane. Then, I use the efflux velocities instead of a rotor. This can reduce the use of a sliding mesh method for a long period. Consequently, it reduces the cost and time. Do you think it is workable? If yes, how to do the settings?


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