[Nek5000-users] **ERROR**: Failed in HMHOLTZ

[nek5000-users at lists.mcs.anl.gov]

Hi Fred,

I don't think the the residual projection (p94,p95) is your problem!
Please post your USERIC, USERBC, complete logfile.

Stefan



On Jan 19, 2010, at 8:55 AM, nek5000-users at lists.mcs.anl.gov wrote:

> Hello,
> 
> when I run my simulation (periodic open-channel flow) I got the following error message at timestep 6:
> Step      6, t= 1.0043885E-01, DT= 2.1145021E-02, C=  0.203 1.7406E+01 3.5078E+00
>            Solving for fluid
>    6  6.1565E-10  6.1565E-10  1.0000E+00     0 alph1x
>    6 halpha   0
>         6    Hmholtz VELX:      1   4.3435E-10   6.1565E-10   1.0000E-08
>    6  2.6858E-09         NaN         NaN     1 alph1x
>    6 halpha   1         NaN
>    6  5000 **ERROR**: Failed in HMHOLTZ: VELY          NaN          NaN   1.0000E-08
>    6  6.2743E+00  8.5949E-01  7.3000E+00     1 alph1x
>    6 halpha   1  2.0336E+00
>         6    Hmholtz VELZ:     76   8.4969E-09   8.5949E-01   1.0000E-08
> reorthogo:           1
>   6    1 alpha:         NaN
>    6   1         NaN         NaN         NaN alph12
>         6    U-Pres gmres:      120          NaN   1.0000E-05          NaN   1.5230E+01
>          6  DNORM, DIVEX                       NaN                       NaN
>         6   1.0044E-01  1.2954E+02 Fluid done
> 
> In the rea-file the parameter 94 and 95 are set to:
> P94 = 5.0
> P95 = 5.0
> 
> If I set P94=0.0 the simulation is running without stopping at timestep 6. I tried to decrease P21 (DIVERGENCE) and P22 (HELMHOLTZ) similar to the turbChannel example, but without succes.
> 
> May you help me with this problem?
> 
> 
> Thanks a lot.
> 
> Best regards,
> Fred
> 
> 
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