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Old   February 5, 2012, 05:57
Default Divergence detected Errors
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Vaibhav Rai Khare
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In my model while iterating..every time i get some errors like:

Divergence detected in AMG solver: temperature
Divergence detected in AMG solver: x-momentum/y-momentum

and at last
floating point error: invalid number

What does they implies? it is related to under-relaxation factor? How could i solve these type of errors??

And what is floating point error.How can it be avoid.??
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Old   February 5, 2012, 08:41
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Quote:
Originally Posted by vaibhavraikhare View Post
In my model while iterating..every time i get some errors like:

Divergence detected in AMG solver: temperature
Divergence detected in AMG solver: x-momentum/y-momentum

and at last
floating point error: invalid number

What does they implies? it is related to under-relaxation factor? How could i solve these type of errors??

And what is floating point error.How can it be avoid.??

Please see this post:

http://cape-forum.com/index.php/topic,446.0.html
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Old   February 6, 2012, 13:42
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You should do the followings
1. If you are using Implicit scheme, reduce you Courant no to 1 and then iterate, if same problem again accurs reduce it more until your solution stablizes

2. If you are using Explicit scheme, reduce Courant no <<1 in order to stablize your solution and also reduce your Under Relaxation Factors

3. Floating point error occurs when something gets divided by zero in iterations, so check your BC's and specify the correct velocities, pressures etc

Good luck
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