All Questions
7 questions
2
votes
3
answers
639
views
How to begin writing scientific codes in C++ in Trilinos or PETSC style?
My background: I have taken some courses on numerical analysis during my PhD and read a few books on the topic as well. I mostly work on low Reynolds number fluid mechanics and use boundary element ...
- 45
1
vote
0
answers
125
views
Dealing with non-physical negative ODE solutions using ODEPACK
Hi and thank you all again. I am solving the reaction-diffusion-advection equation as follows
$ \partial_{t} n\left(t,z\right) = -\partial_{z}\left(\Phi\left(t,z\right)\right) + p\left(t,z\right) -n\...
0
votes
1
answer
251
views
implicit method (crank-Nicolson) I not understand the procedure [closed]
I'm trying to understand the passage through this equation can be written for easily solved with the fortran alghorithm in particular i don't understood the meaning of L_x and L_xx ... what (-1,0,1) ...
4
votes
0
answers
431
views
Algorithm for face based data-structure - CFD
Good morning
I'm trying to develop an unstructured CFD code to solve Euler equations in a finite-volume (cell-centered) context (learning purposes). I was able to build from a cgns file some basic ...
- 77
1
vote
2
answers
757
views
derivative of an array
Hi I am trying to take a derivative of an array but am having trouble. The array is two dimensional, $x$ and $y$ directions. I would like to take a derivative along $x$ and along $y$ using central ...
3
votes
1
answer
7k
views
How do I program periodic boundary conditions? [duplicate]
Hi I have a code below that solves non linear coupled PDE's given Dirichlet boundary conditions. However I need to implement periodic boundary conditions. The periodic boundary conditions are ...
- 31
1
vote
1
answer
1k
views
Parallel 2d heat equation (implicit timestepping) using MPI
I am trying to solve the time dependent heat equation with backward euler timestepping and second order space finite differences. This results in a Poisson system needing to be inverted. In serial ...
- 1,929