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Please excuse me if this question somehow looks trivial or not really interesting, but I recently have a hard time to convince someone else that my algorithm for constructing a...
Asked on 01/04/2022
1 answerI parallelized my code with openMP, and now have this bug in my code that's really odd. If it's the first time I run on a computer, it segfaults, but...
Asked on 12/31/2021
0 answerI am trying to solve a problem with 2D Convection-Diffusion equation with U = Concentration ($mg/m^{2}$) using Implicit Upwind Finite Difference Method like this $$ frac{partial U}{partial...
Asked on 12/24/2021
1 answerBackgroundIn solid fem, we often solve $$mathbf{Ku}=mathbf{p}$$where $mathbf{K}$ is global stiffness matrix, $mathbf{u}$ is displacement, $mathbf{p}$ is global load vector. If displacement not be constrained,...
Asked on 12/22/2021
3 answerI am trying to model a linear elastic material in Abaqus using a UMAT. For my application, I need to rotate the 6x6 compliance matrix for a given set of...
Asked on 12/19/2021
1 answerI use python for my algorithm which uses only one core and I need more processing speed. I have i7 6700K CPU with 8 cores. How to convert them to...
Asked on 12/19/2021
1 answerConsider the following stochastic differential equationbegin{equation}dy=left(A-left(A+Bright)yright)dt+Csqrt{yleft(1-yright)}dWtag{1}end{equation}where $A$, $B$ and $C$ are parameters and $dW$ is a Wiener increment.Equation $(1)$...
Asked on 12/17/2021
0 answerI've been trying to understand the Fast Multipole Method but not really getting anywhere. It seems like the fastest mainstream N-body simulation algorithm, and I would like to...
Asked on 12/14/2021
2 answerI have used different variants of the Laplacian operator (div grad) using 4, 8, 12, 20 and 24 of the closest points. I get problems due to the chosen coordinate...
Asked on 12/14/2021
1 answerI was wondering if anyone could enlighten me about the convergence properties of the truncated newton method in case of a non-positive definite hessian $nabla^2 f = H$. From...
Asked on 12/12/2021
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