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

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

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