|
[Sponsors] |
December 21, 2012, 06:04 |
k-Omega-SST: y+ values explode
|
#1 |
Member
Sören Sander
Join Date: Sep 2012
Location: Germany
Posts: 43
Rep Power: 13 |
Hello everyone,
I am calculating the cooling of a hot wall. My case is a 2D channel filled with water. My velocity is ramped and starts at 0 m/s and rises to about 5 m/s. The temperature is 1000 K at the wall (coupled, decreasing with time). The temperature of the water at the inlet is 300 K. I pre-estimated my yPlus for 5 m/s and a value of y+=1. My model is k-omega-SST with low-Re correlation. After my first calculation was done, I evalueted y+ and it was around 55 instead of 1. So I reduced the distance of the first cell to 1/10 of the original value. I my view this should decrease y+ from 55 to about 5.5. To my surprise y+ went up to 55 again. Where am I mistaken? Is my model still valid, even though I am not resolving the viscous sublayer? How can I decrease y+? I plot turbulence -> yPlus -> direction along my boundary. |
|
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
TimeVaryingMappedFixedValue | irishdave | OpenFOAM Running, Solving & CFD | 32 | June 16, 2021 07:55 |
SST k-w model--the parameter 'omega' does not convergence | zyy95900 | FLUENT | 4 | May 7, 2012 00:58 |
Numerical errors in nested domain with pre-calculated boundary values | Arnoldinho | OpenFOAM Running, Solving & CFD | 3 | April 4, 2012 11:31 |
Implementation details of SST k-omega model | Niels | Main CFD Forum | 3 | July 3, 2008 18:45 |
Plotting raw data values | Wilesco | Siemens | 0 | January 5, 2006 06:34 |