[Nek5000-users] Restart using rea

Wed Aug 1 10:16:37 CDT 2018

Dear Nek users,

I ran into a problem when restarting using the .rea file. In the .rea file, I specified the name of the file (the file was renamed from the last time step of the previous simuiatlion)to restart with:

  ***** NO THERMAL BOUNDARY CONDITIONS *****
            1 PRESOLVE/RESTART OPTIONS  *****
restart.fld

Without changing the time step size, I restarted the simulation, but I received an error:

Step    581, time= 3.0955000E+02, DT= 5.0000000E-02, C=  4.240 4.3486E+01 1.1724E-01
             Solving for fluid
        581  Hmholtz VELX      12   1.5661E-12   7.4073E-01   5.0000E-12
        581  Hmholtz VELY      11   9.6329E-13   3.3660E+00   5.0000E-12
        581  Project PRES           5.5975E-05   1.6744E+00   2.9913E+04  13  20
        581  U-PRES gmres     120   6.1973E-10   1.8658E-06   5.0000E-12   4.3239E-02   1.0688E-01
        581  Fluid done  3.0955E+02  1.1453E-01
     581  3.09550E+02  6.46747E+01  0.00000E+00  7.53982E+02  blasius: delta*
CFL, Ctarg!   7.39542251238818       0.500000000000000

The original CFL was only 0.028 or so, after restart, it fluctuates significantly and eventually it quits for CFL being too large. Could anyone help me on this please?

Many thanks
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