The simulation tag has no wiki summary.
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20 views
Molecular dynamics simulation: fluctuating dipole model implementation
I'm conducting a molecular dynamics simulation for silica. Some time ago I turned to the fluctuating dipole model, and after a much efforts I'm still having problems implementing it.
In short, all ...
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3answers
39 views
Magnetic B Field of Point Charge Not at Constant Velocity
I'm working on an N-body simulator for charged particles. I know that moving charged particles generate a magnetic field, and another moving charged particle could be effected by this magnetic field.
...
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2answers
84 views
I want the Saturn's position in terms of Declination and Right Ascension?
I want the Saturn's position in terms of Declination and Right Ascension for a couple of month in the interval of 1 hour in a text file to do a simulation. Which site can provide me these data?
Or, ...
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0answers
19 views
How to make a fan like behavior [migrated]
I am making a game in Unity. I have an object e.g. cube. I want to release air from it like fan so that when other cubes come closer, it throws them away. What velocity,force etc I will need to do ...
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1answer
89 views
neutron transport approximations for nuclear rocket modelling
I'm pretty ignorant regarding neutron and nuclear transport modelling, but i'm interested in trying to pursue it for a particular pet project. It regards modelling of nuclear reactions like those ...
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7answers
1k views
How many bits are needed to simulate the universe?
This is not the same as: How many bytes can the observable universe store?
The Bekenstein bound tells us how many bits of data can be stored in a space. Using this value, we can determine the ...
-3
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1answer
59 views
How do we simulate Nuclear explosion? [closed]
I am interested in PC simulation, i use physics equations to simulate rain, fire, wind, cloud and lightning. it is a kind of VR (virtual reality).
what equation is able to simulate a virtual nuclear ...
-1
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1answer
62 views
Earth and Moon computer simulation [closed]
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.
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1answer
85 views
Initial position and velocity of rocket to escape earth's gravity
I'm trying to numerically simulate a spacecraft trajectory between earth and mars. I already wrote the solar system model where the sun is at the origin of the x,y,z plane Earth and Mars are orbiting ...
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7answers
2k views
Is there a general physics simulator for learning purposes?
Is there a complete physics simulator that I can use to do general simulations for learning purposes? For example:
Create a sandbox.
Fill with a gas.
Load a 3d solid model like this (but 3d).
Fill ...
-1
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0answers
52 views
How can I simulate metric equations in relativity theories? [closed]
I want to simulate tensor equations of general relativity like Einstein's field equation, what I have to do? What PC program I've to use?
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0answers
24 views
If we find a way to simulate a universe, are we likely to be living in a simulation? [closed]
If we eventually find a way to use quantum computers to simulate the creation of a consistent universe, does that prove that we are extremely likely to be living in a simulation?
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2answers
742 views
Why can't Humans run any faster?
If you wanted to at least semi-realistically model the key components of Human running, what are the factors that determine the top running speed of an individual? The primary things to consider would ...
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1answer
56 views
Deriving the change in the Helmholtz free energy in the context of the free energy perturbation method
I am reading Free Energy Calculations: Theory and Applications in Chemistry and Biology by Chipot and Pohorille. At the beginning of the text (page 19, for example), the authors define the Helmholtz ...
5
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1answer
145 views
Why do air bubbles stick to the side of plastic tubing?
I'm watching water with air bubbles flow through transparent plastic tubing. The inner diameter is a few mm. Bubbles typically are the same diameter as the tubing, with length about the same or up ...
1
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1answer
2k views
Calculation of the G-force
I have a formula which is $\text{G-force} = \frac{v\omega}{9.8}$, where $v$ is speed and $\omega$ is the angular velocity. I've seen on the internet that G-force is actually $\text{acceleration}/9.8$. ...
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1answer
42 views
What creates the differences between the two channels of a stereophonic signal?
Given two identical microphones arranged in an ideal XY pattern, recording a single sound source at equal distance from both capsules, the two signals obtained are equal in amplitude, perfectly in ...
2
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1answer
55 views
Simulations of Planetary Motions
I wrote a spreadsheet that simulates the trajectory of 3 planets in 2D space. The method is simple: for each moment in space, calculate the force felt and velocity of each planet, then for the next ...
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0answers
57 views
Final-state baryons in $p \bar p$ collisions in Pythia
I'm trying to simulate inclusive $\chi_c$ production in $p \bar p$ collisions at very low energies (~ 5.5 GeV) using Pythia8 event generator. Leaving aside problems bounded with applicability of ...
2
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1answer
80 views
Local minima in Ising model in a Monte Carlo simulation
Is there any way to check whether in a Monte Carlo simulation using Ising model is stuck in any (false) local minima of energy or not, particularly in 3D system ?
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2answers
84 views
Erogodicity in a Monte Carlo simulation
Q1: What is the ergodicity and ergodicity breaking in a Monte Carlo simulation of a statistical physics problem?
Q2: How does one ensure that the ergodicity is maintained ?
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2answers
91 views
Argument against computer consciousness [closed]
Imagine that we have a computer program that produces the conscious awareness of the present moment.
Let us assume that every time the program is run a counter is incremented.
Let us also assume ...
1
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1answer
53 views
Simulating an orbit, primary is not at focus
I've been toying around with some -very- simple orbital simulators, mostly using preexisting physics libraries (I took a layman's stab at doing it with vectors too). The thing that is confusing me is ...
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14answers
9k views
Best (most realistic) physics game? [closed]
Inspired by a similar post, I wanted to know what video games, past or present, most accurately employ the laws of physics.
I believe this is an appropriate question for this site, since the users ...
3
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1answer
368 views
Simple 2D Vehicle collision physics
I'm trying to create a simplified GTA 2 clone to learn. I'm onto vehicle collisions physics. The basic idea I would say is, To apply force F determined by vehicle A's position and velocity onto point ...
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0answers
131 views
Simple thermodynamics simulation software [closed]
Just looking for some simulator that I can model a simple boiler with a heat source, overpressure valve and steam tap so I can play around with some parameters and learn the fundamentals of heat ...
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0answers
45 views
Should a 1D Guassian wave oscillate?
I wrote a few lines that numerically solve Maxwell's equations.
The result is a moving wave that looks like a single pulse.
This looks strange to me because I expect waves to move in oscillator ...
1
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1answer
71 views
How to get the new direction of 2 disks colliding?
I'm developing a 2D game including collisions between many disks. I would like to know how I can get the angle corresponding to the new direction of each disk.
For every disk I have this information ...
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0answers
45 views
Animating the Bosonic String
I am interested in studying the classical solutions to the Bosonic string in flat 3+1 dim. spacetime by having them rendered a moving picture on a computer. This is partly for fun, and partly to ...
6
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1answer
163 views
partial trace with sparse matrices
Let $\rho_{ABCD}$ be a sparse matrix of 4 systems each in a $d$-dimensional Hilbert space.
For $d<7$ in a reasonable time (few seconds) I able to perform the partial trace $\rho_{AD}$ using the ...
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0answers
149 views
Comparison of different ab-initio codes
One may find on the web a lot of different computational packages to perform "ab-initio" calculations of electron structure of the solids. Usually, the documentation is not quite transparent about the ...
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0answers
96 views
Requesting decent analysis on FEMM simulation data
I have been running simulations in FEMM for different magnetic configurations as an attempt to understand better how do they work and why it is impossible to come up with the holy grail of energy: a ...
2
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2answers
61 views
How should I simulate the electric potential field from a wavefunction?
I was interested in making what I thought would be a simple simulation of an electron encountering a positron by numerically solving the Schrodinger equation over several time steps, but I've run ...
4
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2answers
201 views
How to calculate linar velocity of planet orbit?
I try to simulate a solar system with planets (with random mass) placed randomly around a sun with a mass $X \times \text{solar mass}$.
The simulation is going well when I use real data ...
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2answers
139 views
Planet's Moon attrated by sun [closed]
I'm currently writing a code to generate solar system and $N$ number of planets / moons.
I use real data to test (earth / sun / moon data).
I succeeded in placing the earth and make it orbit around ...
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1answer
153 views
How to simulate temperature change of oven?
I am trying to write a software, which will model the oven temperature change when turning on/off. The data I can get is graph, by taking temperature reading each second from T0 time up to some ...
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1answer
207 views
Simulating the evolution of a wavepacket through a crystal lattice
I am interested simulating the evolution of an electronic wave packet through a crystal lattice which does not exhibit perfect translational symmetry. Specifically, in the Hamiltonian below, the ...
8
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10answers
76 views
Are there websites or programmes that permit a simulation of the night sky in the past and the future on an ordinary computer?
Are there websites or programs that permit a simulation of the night sky in the past and the future on an ordinary computer?
(For the past, I would be content with objects visible to the naked eye.)
...
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2answers
589 views
How to implement Heun's method to solve a 2nd order ODE? [closed]
I am trying to simulate a soft body object by having a collection of points connected by springs. I also want to have the object bounce on a plane. I have been able to implement Euler's method to make ...
9
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1answer
74 views
How can one build a multi-scale physics model of fluid flow phenomena?
I am working on a problem in Computational Fluid Dynamics, modeling multi-phase fluid flow through porous media. Though there are continuum equations to describe macroscopic flow (darcy's law, ...
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2answers
116 views
Simulation of QED
Can anyone point me to a paper dealing with simulation of QED or the Standard Model in general? I will particularly appreciate a review paper.
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1answer
261 views
Are We Living in a Simulated Universe? [closed]
If the universe is just a Matrix- like simulation, how could we ever know? Physicist Silas Beane of the University of Bonn, Germany, thinks he has the answer!. His paper “Constraints on the Universe ...
2
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1answer
49 views
Creating/Downloading a large Galaxy Dataset
I was wondering where I can get a more or less complete set of a galaxy to test an n-body simulation (preferably two colliding galaxies with approx 300k to 1M elements).
Is it possible to extract ...
2
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1answer
296 views
Rolling (without slipping) ball on a moving surface
I've been looking at examples of a ball rolling without slipping down an inclined surface. What happens if the incline angle changes as the ball is rolling?
More precisely I've been trying to find ...
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0answers
23 views
Rolling (without slipping) ball on a moving surface 2 [duplicate]
Possible Duplicate:
Rolling (without slipping) ball on a moving surface
Apparently I didn't log in properly when I asked a question this morning: Rolling (without slipping) ball on a moving ...
5
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1answer
85 views
Convert latitude of lowest altitude to argument of perigee?
I am designing an orbit around Mercury. I know the values I want for the semi-major axis, eccentricity, inclination, and RAAN. I want the altitude of closest approach (periapse) to occur at ...
2
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1answer
52 views
Could there be a sort of “Molecular Destiny”?
Let's say we start with the Big Bang. Every bit of matter started from this event. Therefore, given EVERY variable (every particle, movements of particles, weights, times, etc) and an INFINITE amount ...
0
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1answer
142 views
Software to simulate dynamics of objects in a given gravitation field [closed]
I want to simulate and test set of 2D designs that basically have pulley/gear/chain-linked systems under Gravity (For e.g. to check how a pulley would rotate given particular weights, of course I'm ...
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2answers
29 views
Sampling typical clusters between distant points in subcritical percolation
I have on several occasions wondered how one might proceed in order to sample large subcritical Bernoulli bond-percolation clusters, say on the square lattice.
More precisely, let's consider the ...
4
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1answer
451 views
Stellar evolution simulation engine or software
Is there any general purpose stellar evolution simulation engine or software? Something to throw in properties of the star and to watch how (and why) they change along the timeline - with or without ...
