Questions tagged [simulation]

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

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2answers
821 views

How to solve the stiff equation in this Restricted Three Body Problem numerically?

I've come across a stiff equation in solving the Circular Restricted Three Body Problem. [An object is moving considering the effect of the gravitational forces caused by two gravitational sources ...
5
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1answer
876 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 ...
0
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1answer
145 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 ...
5
votes
3answers
215 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 ...
4
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2answers
152 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 ...
4
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2answers
567 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 ...
4
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2answers
3k 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 ...
5
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0answers
905 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 ...
12
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4answers
443 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 ...
2
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1answer
213 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. ...
3
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1answer
150 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
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3answers
237 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
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1answer
863 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 ...
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0answers
78 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
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2answers
1k 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 ...
30
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7answers
2k 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 ...
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3answers
808 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 ...
5
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2answers
112 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 crystal-...

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