# Questions tagged [computational-mechanics]

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### Exact Riemann Solver for Multi-Component 1D Euler Model

I am concerned looking for an exact Riemann solver for compressible 1D multi-component Euler equations, supplied with the ideal gases equation of state and under the assumptions: Mechanical ...
• 11
294 views

### Does the weighted residual method not use energy minimization in any form?

I've come across several texts/papers utilizing the concept of a minimum potential energy state corresponding to an equilibrium state, and I know that it is used in FEM formulations that are based on ...
117 views

### FENICSx or deal.ii for modeling fluid structure interaction of cylindrical energy harvesters in various arrangements

I'm trying to model fluid-structure interaction of cylindrical energy harvesters in various arrangements. I have chosen OpenFOAM for the fluid part but I have no clue which framework to use for the ...
• 123
100 views

### Runge Kutta 4th order: unexpected result

My problem in brief: in some situations, the Runge Kutta 4th order method (RK4) doesn't seem to give 4th order improvement when using a smaller time step. I wonder how this worse-than-expected result ...
• 121
149 views

### How can I incorporate angular momentum in this code?

I'm currently working on the 3-body problem, and I was writing a code to plot the trajectories of all 3 bodies while also manipulating the angular momentum of the system. I found a code online and ...
• 123
197 views

### Neumann BC in the current configuration in a finite-strain problem

For a hyperelastic problem, I understand the variational formulation can be written as the minimisation of $\Pi$ with \$\Pi = \int_{\Omega} \psi( \pmb{u} )dx - \int_{\partial\Omega} \pmb{T}\cdot \pmb{u}...
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