What happened to SecondDerivativeImplicitEuler ?

[mangerij]

Hi,

I vaguely remember that there used to be a SecondDerivativeImplicitEuler.C Kernel in solid_mechanics before it was migrated. Is this somewhere? Was it removed?

Thanks,
John

[aeslaughter]

@sapitts Do you know this answer?

[sapitts]

Looks like that particular Kernel was deprecated and not migrated over to tensor mechanics. It could be that similar functionality exists elsewhere in MOOSE, but where I do not know. Perhaps @cbolisetti or @jasondhales might know?

[cbolisetti]

I don't know :( Maybe @bwspenc?

[mangerij]

Well it would be nice to have it back... I remember it worked correctly.

[hugary1995]

If you are talking about this one: https://github.com/idaholab/moose/blob/mlpack-15154/modules/solid_mechanics/src/kernels/SecondDerivativeImplicitEuler.C , this is now simply a special case of the InertialForce kernel.

The inertial force kernel uses NewmarkBeta time integrator. A special case is

• density = 1.
• eta = 0, alpha = 0. No damping.
• Gamma = 0.5, beta = 0.25. These are default parameters of NemarkBeta.

which reduces to second order implicit euler.

[mangerij]

excellent.. Good to know here.