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shock wave in very high pressure gradients

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Old   October 24, 2011, 13:42
Default shock wave in very high pressure gradients
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navid
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Hello all,

I want to simulate a shock propagation induced by a very high pressure gradient of inlet and outlet (around 1 Giga Pa).
I am using an explicit solver with first order upwind and with time steps of around 10^(-10) since I just need to model a very short time after shock initiation.
The problem is when this pressure gradient is around 10 MPa, i will have very good results but as I change it to higher pressures, it gives me these errors:

Error > (greater-than): invalid argument [2]: wrong type [not a number]
Error Object: -1.#ind

Error: WorkBench Error: Could not handle event: SolutionStatusUpdate
Error Object: #f


these errors appear after one iteration! does any body have any idea?
is fluent capable of simulating this high pressure gradients?

thanks,
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Old   October 24, 2011, 14:17
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Chris, Kam
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I'm not kind of expert but...

1. did you checked solution limits?

2. if you reduce under-relaxtion coefficients, it might be...

3. mesh can occur problems


good luck
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Old   October 24, 2011, 14:19
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Chris, Kam
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oh dear lord..

how can I delete this text?
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Old   October 29, 2011, 13:54
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navid
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I have checked all of this but this error appears at the first step. any idea?
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Old   February 26, 2013, 19:48
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how did you solve the problem?
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