On Feb 21, 2013, at 3:25 PM, Roy Stogner <[email protected]> wrote:

>> 
>>  Additionally, within the existing framework, how does one account for
>> *nonlinear* systems that have a mass matrix
>> 
>>  [M] du/dt = f(u)
> 
> Right now, we allow you to request an "elem_fixed_solution" that can
> be used for either low-order time integration of nonlinear mass
> matrices or for nonlinear stabilization in test functions.  We're
> actually planning a (backwards-incompatible, unfortunately) change in
> this API, to make it less unnecessarily confusing and to allow for
> higher-order time integration of nonlinear mass matrices and/or for
> nonlinear mass matrices with nonlinear stabilization in test
> functions.  If you'd like, I could probably push that change up higher
> on my todo list.


Upon further study, it seems like the elem_fixed_solution stores the element 
solution in situations where the elem_solution may contain the velocity or 
delta solution. Is this correct? 

Manav


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