Help:Finding sources of error
Hi,
I've written a NS FVM solver. I'm using Ghia's lid driven cavity result to test for accuracy. The u values for the same grid size typically have difference of less than 2%, except one which is different by 20% (0.003 vs 0.004). However, the v values typically have difference of 2-5%. I'm wondering if that is acceptable... I'm trying to find out the source of error. I was thinking of wrong implementation of BC but then my u values will not be so close then. Hence I suspect that there are some careless mistakes in my v,y BC. Is that logical since my v values differs by 2-5%? Thank you very much |
Re: Help:Finding sources of error
Firstly, if You would like to get help here, please give description of Your solver.
NS FVM solver rather wide formulation When I had the same problem, I fixed it having found a mistake in high-order discretization schemes of convective terms (there was a bug). With BC there have not to be problems U and V all zero except upper wall where U=1. As a rule on the fine grid (300x300) with HLPA scheme You should obtain excellent results All that from my experience with SIMPLE solver on staggered as well as colocated grids |
Re: Help:Finding sources of error
By the way, how do You get Ghia's velosity distribution?
|
Re: Help:Finding sources of error
what do you mean by how to get Ghia's velosity distribution?
the velocities are given in his paper in journal of computational physics 1982 48 p387 |
All times are GMT -4. The time now is 02:25. |