Simulation is the process of mimicking the behaviour of a real physical process or system using a representative model.

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BiCopter simulation in Matlab

I derived a bicopter dynamical model with two servos and two BLDC motors. And now am trying to simulate it using Matlab. As base for simulation I used this paper and this code Unfortunately, the ...
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37 views

Software to simulate behavioral economic models?

I am looking for a way to simulate behavioral economic models to illustrate the effects of changing parameters. I am familiar with statistical analysis (especially R), but I only have few programming ...
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18 views

validating results of a hypersonic flow

I am trying to simulate the air flow behind a strong shockwave. The air mixture in nonequilibrium contains only 5 species(N2, O2, NO, O and N) where the three molecules are in vibrational ...
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42 views

Color Coding Gradient in Matlab

I am trying to visualize bond strength via a color gradient in matlab (such that a high energy would be in red, low in blue). The underlying data structure, bond locations, and bond energies are ...
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1answer
48 views

Solve implicit ODE numerically in orbit simulation

I'm trying to plot the orbit of a compact binary star system where general relativistic effects become important. I'm using post-Newtonian approximation and I want to solve the orbit numerically based ...
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1answer
54 views

How to calculate divergence and vorticity from a velocity field using finite elements

I am in the process of writing a finite element solver for the Navier-Stokes equations and am having trouble computing things like the divergence and vorticity correctly. Currently to compute the ...
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1answer
96 views

Implementing the pressure correction method using finite elements

Ok so I am nearing the completion of my finite element Navier-Stokes solver that uses the $\theta$-method for time stepping and the pressure correction method for the pressure. I am following the ...
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0answers
30 views

ANSYS Fluent: Defining External Force on a Cell Zone [closed]

I am using ANSYS Fluent 15 to simulate a case of fluid flow. In my case, I have three cell zones in my simulation, let's call them top, middle and bottom. My requirement is to put a vertical constant ...
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1answer
62 views

Pressure projection method boundary conditions

When using the pressure projection method to solve the incompressible Navier-Stokes equations do we apply Neumann boundary conditions for pressure only where there are associated no-slip velocity ...
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1answer
69 views

CFD turbulence modelling mean pressures vs peak pressures

I have been experimenting with using Autodesk CFD to investigate facade/ cladding pressures on a (rectangular) building, comparing results with cladding/ facades pressures pressures from design codes ...
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1answer
210 views

How to initiate spirals in this model?

I am trying to reproduce Tang & Othmer paper which is related to excitations and oscillations in G-protein model in Dictyostelium discoideum, an amoeba species. The mathematical model in the paper ...
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2answers
100 views

Can other running processes harm the performance of my simulation?

I don't have an high-end machine on which run my simulation (Python + C extensions, based on numpy for calculations) Thus I intend to run the program on my PC, for several hours. I won't use the ...
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13 views

How to do numerical simulation of Impulsive Differential system?

I am working on a research paper on Plant-Pest-Natural enemy model. I want to plot graphs for my system as given below. I know how to simulate differential system using ODE45 command and then using ...
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2answers
108 views

Relationship between FEM solutions of PDE with different spatial resolutions

I use FEM to simulate deformations of elastic objects for animation applications in computer graphics. The governing equation is generally with the form: $$ \mathbf{M}\ddot{\mathbf{u}} ...
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40 views

modify COMSOL codes

I am a physics student and I am planning to simulate microfluidics and capillary waves on a fluid film and I decided to use COMSOL. I am not so much aware of COMSOL abilities. I wonder if I can ...
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0answers
50 views

Conservation at grid interface in adaptive mesh refinement

I am using adaptive mesh refinement to solve one dimensional inviscid Burgers equation. However I am facing some difficulty to handle grid interfaces which are not uniform (coarse-fine grid ...
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1answer
101 views

GPU-enabled Lattice Boltzman solvers?

Is anybody aware of any GPU-enabled Lattice Boltzman solvers (preferably on C++/OpenCL and open-source) that would be recommended? I have found Advanced Simulation Library, but it seems to be very ...
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1answer
43 views

How to generate movie of the simulation done in LAMMPS? [closed]

I simulated nanowire deformation using LAMMPS and visualized it using VMD in Centos 6.5. But I'm not able to generate .jpg image file or the simulation movie. How can I proceed??
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54 views

How come in distributed computing 10X 32GB systems doesn't equal 1 320GB system

is there a mathematical formula to relate how much memory per node is lost when you use parallel computing? for example, when running COMSOL (FEA, MUMPS) in parallel, a problem that would require ...
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2answers
101 views

Should a colorbar have constant values throughout a simulation?

The default option for matplotlib's pcolormesh (also true for VisIt and I think also true for Matlab) is to allow the maximum and minimum of a colorbar vary. Which ...
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56 views

Modelling a Quantum Cascade Laser (QCL - GaAs atop Copper Heat Sink) with COMSOL

I am trying to model this: GaAs on-top of a heat-sink made of Copper. It's trying to simulate a type of Quantum Cascade Laser, I'm looking at the effect the temperature has by running a 10 V ...
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1answer
105 views

Hypersonic flow in Fluent

I am working in my graduating project about the hypersonic flow, particularly the properties of the air behind a strong shock wave, I try to do a simulation for that process in Fluent but I don't know ...
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29 views

Book recommendation on simulation of linear and nonlinear electronic circuits

I am looking for a book on electronic circuit simulation explaining the numerical modeling using transient and frequency based methods from a computational point of view. It should also have an ...
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2answers
94 views

Simulating a Simple Pendulum - Increasing amplitude on each swing?

I am trying to animate a dampened pendulum using RK4 for a highschool project. The equations that describe the dampened system are as follows: (from ...
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1answer
89 views

Surface charge boundary conditon for Poisson-Boltzmann solver

I want to set up a surface charge boundary condition for the simulation of semiconductor and electrolyte interface. The 2D-Poisson example and surface charge boundary condition are shown in following ...
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2answers
114 views

How to interpret/convert density in 2D simulations?

Density has units of $kg/m^3$. In simulations often scaling is done to deal with non-dimensional values, so the physical density is converted to the non-dimensional density so that it can be used in ...
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1answer
46 views

Value of density when there are no or very few neighbours in SPH simulation

Sorry for the noob question. I am trying to implement SPH using the directions shown in this paper. The density needs to be updated using the formula The smoothing kernel is If there are no ...
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61 views

Is there an opensource aircraft boarding simulator?

A friend and myself think that we have developed a method to speed up the boarding process of large aircraft. After doing a quick patent research we think about launching a start-up. Before doing so ...
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71 views

Tracking the speed of 2D oscillations on a lattice

I wrote a Monte Carlo simulation of the 2D Lotka-Volterra model on a discrete lattice (with periodic boundary conditions). A video that I produced (which images the system after some number of monte ...
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51 views

Is it normal to expect the error of simulation of a damped harmonic oscillator to decrease as the damping factor decreases?

I am simulating a damped harmonic oscillator using the RK4 method of numerical integration. I am comparing the simulated results with the analytical ones (for the free evolution case) and obtaining ...
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0answers
39 views

Parameter estimation with RNetLogo : chosing estimation technique with both continuous and discrete parameters

I want to estimate parameters for an agent-based model in Netlogo using R and the RNetLogo ...
2
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1answer
107 views

Poisson solver diverged

My 2D-Poisson solver is build for simulation of semiconductor. The algorithm is Gauss-Seidel iterative method. If I use simple PN junction for simulation testing, it diverged while I applied high ...
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3answers
428 views

What are the differences between CFD simulations and realistic ocean/atmosphere model simulations?

The field of computational fluid dynamics (CFD) is dedicated to solving the Navier-Stokes equations (or some simplification of them). A subset of CFD, ocean and atmospheric models numerically solve ...
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2answers
295 views

Using Trilinos and/or Petsc in Windows with Visual Studio?

I am currently working on a project of building a simulator. Up till now I have mostly played around with very simple examples, but with regards to the future I have been thinking that it might be a ...
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1answer
94 views

Confusion in modeling and computing [closed]

I come from a computer graphics background without any professional in computational science. But I find my job(game engine development) being related to this field. May I ask some general questions ...
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1answer
286 views

Numerically solve a PDE in Python with a term calculated by coarse-graining

I'm trying to solve a PDE in Python of the form, $\dfrac{\partial c(\mathbf{x}, t)}{\partial t} = \mathrm{D} \nabla^2 c(\mathbf{x}, t) -\gamma \rho(\mathbf{x}, t) c(\mathbf{x}, t)$ where $c$ ...
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2answers
89 views

Simulating interaction of Smart Fluids with Solids

Is it possible to simulate interaction of Smart Fluids with Solids? Is there a software capable of doing so? What I Know: The two software that I know of are Autodesk Simulation Mechanical and ...
5
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1answer
180 views

Lagrange Multipliers in Multi-body Finite Element Code

I'm working on a Multibody dynamics code using the finite element method to simulate the behaviour of flexible beams (using this paper if anyone is interested/ it is relevant). I'd like to model ...
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2answers
172 views

Which processor should I consider buying for a desktop built for scientific computing?

I run Python/C simulations for biological problems, so the range of computational tasks can be broad. Here are some examples: 1) continuum model simulations: FEM type 2) agent-based simulations: ...
4
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1answer
57 views

Iteratively refine bounds on exp for Metropolis criterion

In Monte Carlo simulations, using the Metropolis criterion, one often has to compare a random number $a$, $0 \leq a < 1$, to the Boltzmann distribution $exp(-\beta\Delta E)$, where $\Delta E$ is ...
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25 views

Particle Collision to Static paticles

I have a system of particles with equal distance with each other and another at random positions which is moving with time. I want to know: a) The method by which I can reduce the number of particles ...
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1answer
222 views

PyOpenGL/OpenGL Generating Cosmic NBodys

I am working on a Universe Simulator. I'm stuck on creating the dark matters webs of the universe that look like this: http://www.mpa-garching.mpg.de/galform/data_vis/sim3dnew-highres.png I am ...
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2answers
236 views

How can I create a computational model of the human eye?

I need to create a program that can simulate the optical system of the human eye. The input will be any image, the output would be the image that is projected onto the retina. I need it to be as ...
2
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3answers
343 views

Implementation of Navier-Stokes Equation for Ocean Waves

I am doing an undergraduate research to model ocean waves in shallow waters in real time. I am trying to base my research on Navier-Stokes equations since they produce the most accurate mathematical ...
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4answers
139 views

Removing non-determinism from molecular dynamics code

I've been looking through the other answers, and I haven't found a good answer yet. I'll describe the simulation I am running, and then the problems. The program simulates particles undergoing ...
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4answers
155 views

What scale problem can be simulated on an PC using Smooth Particle Hydrodynamics?

I want to simulate tidal features in a large body of water using was smooth particle hydrodynamics. For a system composed of an incompressible fluid, what general scale of problem can be tackled with ...
2
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0answers
52 views

Algorithms for adding hydrogens on a molecule

I want to add hydrogens to some linear polymer molecules (polyethylenes). I know some working methods like using PyMOL internal function h_add. This method works, but hydrogens are added at distances ...
1
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1answer
111 views

Is it possible to simulate fluid dynamics in a time-based and deterministic manner?

The Problem Domain I have a number of network-connected PCs. I want to be able to simulate and replicate the same simple fluid dynamics simulation (E.g. Navier-Stokes), in real-time, between them. ...
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2answers
327 views

Why do the shape of finite elements matter?

I have used FEA for a couple of years now, but using it and using it correctly are two different things, safety factor is not the solution to everything. I have the feeling I won't be using it right ...
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1answer
159 views

Efficient Gravitational Field Implementation

I asked a similar question on physics.stackexchange, being ignorant about this website. I am basically looking for an efficient way to implement gravitational fields. I have a huge 2D space, with ...