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residual and initial state of thruster nozzle |
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October 4, 2009, 08:28 |
residual and initial state of thruster nozzle
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#1 |
New Member
Syed Daniel Shukri
Join Date: Jul 2009
Posts: 2
Rep Power: 0 |
good day
my name is daniel.. i'm a final year bachelor student.. i had some trouble on my Final Year Project... i'm trying to observed the effect of altering the divergence angle and the divergence length on the CD nozzle.. i'm using Spallart Allmaras as my turbulence flow solver.. but its plot on my residual always diverge to the value of 10K.. sometime d iteration stop due to flowing point.. any pointer or paper is highly apritiated S.D |
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October 6, 2009, 17:16 |
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#2 |
Senior Member
Aroon
Join Date: Apr 2009
Location: Racine WI
Posts: 148
Rep Power: 17 |
Which of the equations causes the divergence? How is the mesh quality?
If it is the turbulence equation that starts the divergence, try activating the Cell Quality Remedaition. |
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October 7, 2009, 03:38 |
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#3 |
New Member
Syed Daniel Shukri
Join Date: Jul 2009
Posts: 2
Rep Power: 0 |
Spalart Allamaras is the solver..
in the residual.. the only diverge line is Sa_nut my meshing quality is 0.1% of its original size i'll try several method to avoid failure such as:
ur point of viiew and comment is greatly appritiated |
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October 7, 2009, 15:47 |
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#4 |
Senior Member
Aroon
Join Date: Apr 2009
Location: Racine WI
Posts: 148
Rep Power: 17 |
Is the Cell quality remediation switched on in your Physics model? This often helps in solving divergence problems related to turbulence equations.
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October 9, 2009, 05:02 |
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#5 |
Senior Member
Join Date: Mar 2009
Posts: 260
Rep Power: 18 |
Turn the normalization option of the residuals off.
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