# Turbulence residuals

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 March 7, 2010, 09:53 Turbulence residuals #1 New Member   Jeyaganapathy Chidambaram Join Date: Mar 2010 Posts: 1 Rep Power: 0 Hi, I am running a simple analysis on a flow over a race car. This is just a preliminary analysis and hence I am using the standard ke turbulence model with default CD ADAPCO parameters. All my residuals look OK except for Tdr (Turb. Dissipation rate) and Tke (Turb. Kinetic Energy) residuals. The Tdr and Tke are of 10e-2 order. Should we be worried about this? If so, how can we reduce the Tdr and Tke residuals ? Any advice is much appreciated. Advance Thanks, Jey

 March 12, 2010, 09:41 #2 Senior Member   Join Date: Mar 2009 Posts: 203 Rep Power: 11 Look for the monitor. The residuals are normalized.

 March 17, 2010, 10:31 #3 Member   Vinicius Girardi Join Date: Mar 2009 Location: Sao Paulo, Brazil Posts: 80 Rep Power: 10 You donīt need to worry about that. These residuals are normalized, so you need to monitor another variables such as pressure, drag force, mass flows... When they stabilize your simulation is converged.

July 20, 2016, 23:10
#4
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Join Date: Jul 2016
Posts: 11
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Quote:
 Originally Posted by Vinicius You donīt need to worry about that. These residuals are normalized, so you need to monitor another variables such as pressure, drag force, mass flows... When they stabilize your simulation is converged.
Hi, i am struggling with the convergence problems too. If Tke and Tdr are normalized, I can just ignore them? and only concentrating on monitoring the stabilization of other variables?

 July 25, 2017, 08:14 #5 New Member   Join Date: Jun 2016 Posts: 8 Rep Power: 3 In my opinion, all of the residuals must decrease at least to the order of 10e-4. Please correct me if I am wrong.

July 25, 2017, 14:49
#6
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Ashok Chaudhari
Join Date: Aug 2016
Location: Pune, India
Posts: 113
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Quote:
 Originally Posted by karahan In my opinion, all of the residuals must decrease at least to the order of 10e-4. Please correct me if I am wrong.
Residual for energy of order of E-7 are considered converged.

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 August 4, 2017, 05:48 #7 New Member   wuxsh Join Date: Aug 2017 Posts: 6 Rep Power: 2 Maybe try SST K-Omega model.

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