# Convergence issues with my k-w model

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 July 28, 2016, 20:44 Convergence issues with my k-w model #1 New Member   Join Date: Jun 2016 Posts: 2 Rep Power: 0 Sponsored Links i've been using k-w sst model cause there´re separated flow in the chamber and downstream of it. I'm using y+~1 in my model but i can't achieve a residuals lower than 10-3. the inlet mass flow is around 419 kg/s of water and the pressure outlet 3e6 Pa. How you can see in the image i´m using tetraedrons cells and sweep some zones to reduce the CPU cost. pd: This is a pressure reducier system. i´m waiting for your help, Saludos. file2.png file.png Last edited by pablosanchez03; July 28, 2016 at 22:49.

July 30, 2016, 04:48
#2
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Rahul
Join Date: Sep 2015
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Quote:
 Originally Posted by pablosanchez03 i've been using k-w sst model cause there´re separated flow in the chamber and downstream of it. I'm using y+~1 in my model but i can't achieve a residuals lower than 10-3. the inlet mass flow is around 419 kg/s of water and the pressure outlet 3e6 Pa. How you can see in the image i´m using tetraedrons cells and sweep some zones to reduce the CPU cost. pd: This is a pressure reducier system. i´m waiting for your help, Saludos. Attachment 49498 Attachment 49499
what is your skewness value?
tell the courant number you used for your simulation

July 30, 2016, 13:35
#3
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Quote:
 Originally Posted by raghulvr what is your skewness value? tell the courant number you used for your simulation
i´m using steady pressure-based model, so the model haven´t courant number i guess, the skewnees value is 0,16469. thx

 Tags convergence, k-w sst, residuals, y+~1

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