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Problem diverges: Scalar/Species transport equation

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Old   August 27, 2016, 09:01
Default Problem diverges: Scalar/Species transport equation
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saeid
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Hi
my calculation becomes diverged at 720 CA.
This is the problem ===> Problem diverges: Scalar/Species transport equation, variable
I changed scalar and species transport equation terms in under relaxation factors but still doesn't work.
How can I fix it?
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Old   September 22, 2016, 06:18
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nieman
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Did you use general gas phase reactions module for simulation?
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Old   August 13, 2018, 05:28
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iman pourmousavi
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Quote:
Originally Posted by firemann View Post
Did you use general gas phase reactions module for simulation?
Hello
Im using GGPR and i face this error .could you help me?
Iman
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Old   October 5, 2018, 06:44
Default What happens at 720°
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Stephan Werner
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Hey Iman,
maybe I could help You.

Where do You start simulating, at 0°CA or 180°CA (or maybe even somewhere else)? I had a divergence right when the exhaust valve opened at some point and could solve it with using a smoothening function. maybe that's the case with Yours as well, does the intake valve open at 720° and cause the diversion?
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Old   October 8, 2018, 05:33
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iman pourmousavi
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Hi Stephan
Actually the simulation started at -145.3 CA.
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Old   October 8, 2018, 06:13
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So you start at -145.3° CA at TDC (?), at 574.7° CA you have another TDC and an intake stroke starts. Maybe the intake valve closes at 720°? Did you Use any special functions around 0° like a smoothener for pressure/temperature?

Why do You simulate more than 4 strokes?
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