The simulation tag has no wiki summary.
3
votes
0answers
24 views
Package for determining power output of windmill shapes?
I'm looking for the best package for doing the following: building a 3D model (or loading externally) of a non-standard windmill shape, simulating an airflow over the model, and determining the ...
3
votes
2answers
108 views
How does longer simulation time affect simulation results?
I have a transient flow and solute transport simulation running using a fortran code. The final solution time is 1 day. I need the output of hydraulic head for the output time of 0.5 day. I want to ...
-3
votes
0answers
59 views
What is the matrix? [closed]
My question is abstract, philosophical and sience natured!
I learned that nature runs by laws of math like computers, music, finance, ect.
Fibonacci sequence, prime numbers, the golden ratio and ...
3
votes
2answers
109 views
C++ alternatives for simulating dynamic systems
I'm looking for alternatives to Matlab/Simulink and Dymola for simulating a non-linear dynamic system. I know it's possible to implement the time-domain behavior without a lot of code and a good ...
3
votes
0answers
48 views
How does GAMG in OpenFOAM really work?
I use OpenFOAM for CFD simulations. A very popular preconditioner is GAMG which needs a low number of iterations per a time step in SIMPLE or PISO solvers that are used to simulate the fluid flow.
I ...
2
votes
0answers
62 views
General case Kutta condition
I'm working on a 2D inviscid fluid simulation using a "panel method", with Potential being used to enforce the no-through boundary condition. I'm trying to incorporate the Kutta condition, which says ...
2
votes
1answer
113 views
Boundary conditions in fluid simulation
I'm working on a 2D fluid sim using vortex particles/"vortons" as described in Fluid Simulation for Video Games. Which I think is the same things as the "discrete vortex method". Basically you ...
3
votes
2answers
93 views
Numerical simulation of particle in magnetic field
I'm interesting in numerically simulating (with my own code, not an off-the-shelf package) the motion of a single electrically charged particle in a magnetic field. The field will vary in time and ...
2
votes
2answers
114 views
Magnetic field visualization on Mac OS X?
Does somebody know about any tool for simulation and visualization of magnetic fields either of permanent magnets or solenoids, that can be used on Mac OS X? Maybe there is some software for Linux, ...
2
votes
0answers
107 views
index representation of the diamond lattice
For a kinetic Monte Carlo simulation of solids that crystallize in the diamond lattice structure, I need some efficient representation of the diamond lattice as integer(s), to store it in some ...
8
votes
4answers
185 views
Arbitrary Accuracy Scalable Rope Simulation
I am trying to simulate a rope object. The formulation I understand is an array of particles, connected by springs. These springs have very large k-values, so that the line deforms, but stretches ...
6
votes
4answers
272 views
Fourier pseudo-spectral method and numerical dissipation
Performing a direct numerical simulation of isotropic turbulence with Fourier pseudo-spectral method (Orzag & Patterson, PRL, 1972) using FFT.
For a background of the method, which is widely used ...
1
vote
1answer
145 views
How are collisions detected in simulations?
I want to understand how does the simulation identifies and models when two bodies are colliding with each other. For example car crash simulation. The car moves towards the wall or another crash. ...
7
votes
2answers
155 views
Maximizing unknown noisy function
I'm interested in maximizing a function $f(\mathbf \theta)$, where $\theta \in \mathbb R^p$.
The problem is that I don't know the analytic form of the function, or of its derivatives. The only thing ...
2
votes
1answer
60 views
How to add perturbation to a base state in physical grid space?
For study 3D instabilities problem i.e a base state (velocity field and temperature field) and an additional perturbation.
The method must be independent of the type of instabilities considered but ...
8
votes
3answers
136 views
How to estimate the impact of small scale on large scale in fluid dynamics?
Assuming that a direct numerical simulation is performed, what is a good method for estimate the impact of small scale on large scale in fluid dynamics ? For example is it pertinent to compare two run ...
5
votes
1answer
104 views
What is the scaling or order of molecular dynamics (MD) simulations?
Often in computational science, we talk about the scaling or order of a particular method ($\mathcal{O}(N)$, $\mathcal{O}(N^2)$, $\mathcal{O}(N \log N)$, etc.).
I am having a really difficult time ...
2
votes
0answers
53 views
Can similarity criterion help reducing calculations in Finite Element Analysis (FEA) problems?
Can similarity criterion help reducing calculations in Finite Element Analysis (FEA) problems?
I'm using NX (a thermal and CFD simulation software) to simulate the temperature and fluid field of a ...
5
votes
2answers
211 views
Monte Carlo simulation of 3D X-Y model
I need to compute the helicity modulus as a function of temperature for a three-dimensional X-Y model (see N.K. Kultanov, Yu.E. Lozovik, "The critical behavior of the 3D X-Y model and its relation ...
2
votes
0answers
217 views
How to find Lyapunov exponent for coupled system
Answer gives a software for calculating conditional lyapunov exponent (CLE) for coupled oscillators in chaos synchronization. However, its hard to follow and there is no graphical output of the plot ...
6
votes
3answers
220 views
How to handle large numbers of output data sets from a simulation/sensitivity analysis?
Somewhat related, but I think the question is distinct enough to justify a separate question.
As a bit of background, I come from a observational/statistical Epidemiology background, working with ...
11
votes
4answers
706 views
Parallel Scientific Computation Software Development Language?
I want to develop a parallel scientific computation software from scratch. I want some thoughts on which language to start. The program involves reading/writing data to txt files and doing heavy ...
6
votes
1answer
1k views
What are the advantages and disadvantages of the particle decomposition and domain decomposition parallelization algorithms?
I am running molecular dynamics (MD) simulations using several software packages, like Gromacs and DL_POLY.
Gromacs now supports both the particle decomposition and domain decomposition algorithms. ...
5
votes
2answers
88 views
Are there any QM macromolecule simulation methods that can use an electron density map as input?
I am not an xray crystallographer, but from what I've heard there's often a good deal of guess work and intuition involved in the process of fitting a ball-and-stick molecular model to a ...
21
votes
7answers
446 views
Where do the laws of quantum mechanics break down in simulations?
As someone who holds a BA in physics I was somewhat scandalized when I began working with molecular simulations. It was a bit of a shock to discover that even the most detailed and computationally ...
