|
[Sponsors] |
First order simulation better than second order |
|
LinkBack | Thread Tools | Search this Thread | Display Modes |
May 1, 2012, 12:42 |
First order simulation better than second order
|
#1 |
Member
|
I am finding that the first order solution is much closer to test than second order. I am using the same convergence criteria (max res 5e-4), same boundary conditions, same fluid, etc. Just changing the convergence order. I start with first order/upwind, then from those results go high resolution on both turbulence and pressure, momentum. First order is within 8% of test torque, and second order is 115% over pedicted torque. Mesh changes definitely affect the first order result, but not second order.
This is all a little concerning, as I don't want to just use first order with a mesh that happens to match test as this serves little purpose in development when without test data. |
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Why is my fluent simulation giving Cp values above 1??? | wils | Main CFD Forum | 3 | March 26, 2010 09:12 |
Replacing mesh while running a simulation | akultane | CFX | 1 | November 15, 2009 13:46 |
What's the best order to run this simulation in? | siw | CFX | 1 | November 4, 2009 19:42 |
FSI TWO-WAY SIMULATION | Smagmon | CFX | 1 | March 6, 2009 13:24 |
2nd order conservative schemes | taw | Main CFD Forum | 1 | September 16, 2008 07:05 |