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Old   June 12, 2007, 02:49
Default Floating point error
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I found the message during solution as

Error: Floating point error: invalid number Error object: ()

can anybody tell me about this?

I have tried by

1) Reducing mesh size 2) Changing turbulence model 3) changing turbulence intensity in boundary condition panel 4) Not solving all the equations simultaneously(solve-control-solution panel). Solving the equation one by one or in group of two equations.

I spend lot of time to solve this problem. Can anyone have faced the same one and at the end got the solution, please reply me.

Your failure in this case also may give me the way towards the solution.

thanking you in advance and please reply whatever you know in this respect.

regards, mvee
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Old   June 12, 2007, 11:26
Default Re: Floating point error
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Hi, I had some of those when I was experiementing with my hardware. I am overclocking my cluster and when I pushed it up too high it will throw those, even if the setup appears stable on some benchmarking tests. I just backed down the speed a little and it's fine.

Are you OC'ing your machines? How old are they? If they get dust in the heatsinks sometimes they will get hot and let an electron go the wrong way... Have you run coretemp or anything to see if your processors are heating up?

I'm sure there are other causes for this but that's the one I ran into.
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Old   June 13, 2007, 00:56
Default Re: Floating point error
Markus Lummer
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Old   June 13, 2007, 04:04
Default Re: Floating point error
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Hello Lummer,

I have tried the solution that you have given through the link. I have checked the skewness it is in the range of 0.14. And also i have changed the grid size, reduces the size of grid. About initialization i am confident because i ran the problem with different dimension and it is converged. I am using PISO scheme for Pressure velocity coupling and PRESTO scheme for pressure discretization. So i kept all URF as 1. AT the same time i checked it by changing the URF. Still floating point error is there.

[in your link the author use the word as "numerically stiff situation". What does this mean?]

can you suggest any different scheme?

thanks for your response

regards, mvee
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