Dear Libmesh users,

I have compiled Libmesh, and tried several different options. The program runs fine in all cases and the output of all examples is reproduced except for example 13. Whatever I try, I do not seem to be able to reproduce the output given on the website. There is only a difference between u and u_old in the first step. In the following steps the difference is always 0. If I look at the results with GMV, all output files are the same. This indicates that after the first time step a stationary state has been reached, which seems impossible to me.

Is this a known problem ? Is there something wrong with the code in example 13, or do I have an error in my installation ? I have included the output of the program below.

Your help will be appreciated,

Kind regards,

Rob van Tol.

***************************************************************
Running Example  ./ex13
***************************************************************
 
 Mesh Information:
  mesh_dimension()=2
  spatial_dimension()=3
  n_nodes()=1681
  n_elem()=400
   n_local_elem()=400
   n_active_elem()=400
  n_subdomains()=1
  n_processors()=1
  processor_id()=0
 
 EquationSystems
  n_systems()=1
   System "Navier-Stokes"
    Type "TransientImplicit"
    Variables="u" "v" "p"
    Finite Element Types="0" "0" "0"
    Approximation Orders="2" "2" "1"
    n_dofs()=3803
    n_local_dofs()=3803
    n_constrained_dofs()=0
    n_vectors()=1
  n_parameters()=2
   Parameters:
    "linear solver maximum iterations"=250
    "linear solver tolerance"=0.001
 
 Solving time step 0, time = 0.005
Nonlinear convergence: ||u - u_old|| = 224.402
Nonlinear convergence: ||u - u_old|| = 0
 Nonlinear solver converged at step 1
 Solving time step 1, time = 0.01
Nonlinear convergence: ||u - u_old|| = 0
 Nonlinear solver converged at step 0
 Solving time step 2, time = 0.015
Nonlinear convergence: ||u - u_old|| = 0
 Nonlinear solver converged at step 0
 Solving time step 3, time = 0.02
Nonlinear convergence: ||u - u_old|| = 0
 Nonlinear solver converged at step 0
 Solving time step 4, time = 0.025
Nonlinear convergence: ||u - u_old|| = 0
 Nonlinear solver converged at step 0
 Solving time step 5, time = 0.03
Nonlinear convergence: ||u - u_old|| = 0
 Nonlinear solver converged at step 0
 Solving time step 6, time = 0.035
Nonlinear convergence: ||u - u_old|| = 0
 Nonlinear solver converged at step 0
 Solving time step 7, time = 0.04
Nonlinear convergence: ||u - u_old|| = 0
 Nonlinear solver converged at step 0
 Solving time step 8, time = 0.045
Nonlinear convergence: ||u - u_old|| = 0
 Nonlinear solver converged at step 0
 Solving time step 9, time = 0.05
Nonlinear convergence: ||u - u_old|| = 0
 Nonlinear solver converged at step 0
 Solving time step 10, time = 0.055
Nonlinear convergence: ||u - u_old|| = 0
 Nonlinear solver converged at step 0
 Solving time step 11, time = 0.06
Nonlinear convergence: ||u - u_old|| = 0
 Nonlinear solver converged at step 0
 Solving time step 12, time = 0.065
Nonlinear convergence: ||u - u_old|| = 0
 Nonlinear solver converged at step 0
 Solving time step 13, time = 0.07
Nonlinear convergence: ||u - u_old|| = 0
 Nonlinear solver converged at step 0
 Solving time step 14, time = 0.075
Nonlinear convergence: ||u - u_old|| = 0
 Nonlinear solver converged at step 0
 
 ----------------------------------------------------------------------------
| Time:           Wed May  5 15:55:39 2004
| OS:             Linux
| HostName:       pc02023
| OS Release      2.4.20-8
| OS Version:     #1 Thu Mar 13 17:54:28 EST 2003
| Machine:        i686
| Username:       root
 ----------------------------------------------------------------------------
 ----------------------------------------------------------------------------
| Example 13 Performance: Alive time=8.19504, Active time=5.4663
 ----------------------------------------------------------------------------
| Event                         nCalls  Total       Avg         Percent of   |
|                                       Time        Time        Active Time  |
|----------------------------------------------------------------------------|
|                                                                            |
| linear solve                  16      5.4663      0.341644    100.00       |
 ----------------------------------------------------------------------------
| Totals:                       16      5.4663                  100.00       |
 ----------------------------------------------------------------------------


dr. R. van Tol
Computer Simulations and Foundry Processes
tel.:+32 9 2645704 - fax:+32 9 2645848
mailto:rob.vantol@wtcm.be

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