Function update dependent on time in mixed Element

[dokken]

@VINICIUS_DANIEL_PERE

1. How to determine an initial condition, t=0. For a mixed element

See Initial Conditions for mixed Element - #10 by dokken

@VINICIUS_DANIEL_PERE

2. How to obtain Solution components from mixed elements, and update them for the next time step.
I saw some implementation models to have some reference, such as through interpolation: https://fenicsproject.discourse.group/t/issue-with-updating-time-in-mixed-space/6086/6, 
however, I m not managing to interpolate the components of the mixed space for updating over time.

Similarly, use a FunctionAssigner

Updating a mixed element solutions separately

Hey! I am solving a MixedElement problem, where after every time step the solution is updated for the next step: u_1, u_2, u_2 = split(u) #function values at step n+1 u_n1, u_n2, u_n3 = split(u_n) #functions at step n u_n.assign(u) # Update previous solution as u can see all the function values are updated together using the assign function, But I wanted to know if there is a way to update these values separately. I tried using: ass…