The simulation tag has no wiki summary.
7
votes
3answers
167 views
Is CFD used in animations / movies / art?
This is not a technical question, and is asked just out of curiosity.
Are CFD simulations used in animation movies? (something like shallow water equations, explosion problem etc.)
In other words, ...
0
votes
1answer
40 views
Spring damper model does not work very well
I'm trying to model a spring damper system from a tutorial that I've found on this site.
If I use the exact same parameters as the ones in the tutorial the system is not stable. I've downloaded the ...
2
votes
2answers
85 views
Earth and Moon computer simulation
So I want to simulate the solar system but want to start simple with one orbiting body. However, I never did anything like this before and was wondering if anyone here could give me some hints.
...
0
votes
0answers
24 views
What's the equations for spacial charge distribution in COMSOL?
I am now using COMSOL (RF model) to simulate the optical response of a given object (say, an Au sphere) when experiencing the incident plane wave. I wish to get the spatial charge distribution of this ...
5
votes
1answer
70 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
112 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
2answers
123 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
60 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 ...
3
votes
0answers
70 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
123 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
99 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 ...
5
votes
3answers
165 views
Is there a way to reduce aberration in computations of planets' trajectories?
I don't think the title is very accurate , sorry for that.
I simulate bodies in space using two timestep:
the TIMESTEP is the Δt wich I use to make the calculation
and XTIME is the number of times ...
2
votes
2answers
129 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, ...
4
votes
1answer
116 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 ...
9
votes
4answers
191 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
277 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
150 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
61 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
137 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
106 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
54 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
215 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
220 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
225 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
727 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
462 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 ...
