[CIG-SHORT] Problem about nondimensionalized time step

[Charles Williams]

Hi Tu,

Ideally, your normalization parameters should represent typical (or sometimes smallest) parameters for your problem.  This includes the length scale, which should probably correspond to your smallest cell size.  Are the other normalizer parameters below reasonable for your problem?

If your normalizer parameters are set correctly, I would guess you need to reduce your time step size.

Cheers,
Charles


> On 24/01/2019, at 1:18 PM, tu xiang <tuxiang2016 at outlook.com> wrote:
> 
> Hello, everyone
> I met a problem when I ran earthquake dynamic rupture simulation. It reports that:
> 
> untimeError: Current nondimensionalized time step of 3.3333e-01 exceeds the nondimensionalized stable time step of 3.1180e-02.
> application called MPI_Abort(MPI_COMM_WORLD, -1) - process 0
> 
>  I do not know what does it mean and how to deal with the problem. 
> 
> Here is my nondimensionalized setting:
> 
> [pylithapp.timedependent]
> formulation = pylith.problems.Explicit
> normalizer = spatialdata.units.NondimElasticDynamic
> 
> [pylithapp.timedependent.normalizer]
> shear_wave_speed = 3.0*km/s
> mass_density = 3.0e+3*kg/m**3
> wave_period = 0.3*s
> 
> Do I need to decrease the time step or change the normalizer parameters? Do the normalizer parameters have any relationship with the time step? How can I select the normalizer parameters?
> 
> Best regards
> Tu
> 
> 
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