Simulation Definition and 897 Threads

Homework Statement I am creating an astrophysical simulation involving an arbritary number of particles and each particle is identified via a mass, label, position vector and velocity vector. I have made classes which can perform operations on these vectors and I also have a class which...

Are there any cool simulations of an object traveling into a black hole from the objects point of view? Thanks.

Hello, Homework Statement and Homework Equations I need to simulate a camera given it's Modulation Transfer Function (MTF), which is a polynomial f(x). The expression for the MTF is: y = 2E-08x4 + 0.0008x2 - 0.464x + 1.0076 (with x the spatial frequency in number of cycles/mm)...

I am simulating an unshielded twisted wire pair of a communication network, Controller Area Network. Bus Speeds taken into consideration are 250/500/1000/2000 kbps. Depending on the physical dimensions of the wire and insulation dielectric constant, I have computed the R,L,C,G parameters...

Hello there, I have been searching for MATLAB simulations that analyze optical cavities and there are some useful codes. Yet, I haven't found codes that analyze what happens to cavit transverse modes if spatially dependent phase is introduced between mirrors Does anybody know if there...

Hello fellow physicists, I have a query about a practical matter. I'm trying to simulate the rotational spectrum of a symmetric top and so far I've been able to produce a stick spectrum of it. My first problem is that the lines do not exactly match the positions of the peaks but my biggest...

i believe I'm using the correct equations, but the orbit won't work. here is the relevant code for a 2 particle simple orbit simulation. I'm not sure what I'm doing wrong ... timeStep = 1.0 gravityConstant = 6.67384 * 10.0 ^ -11.0 ... // (initialize particles) // p[n].m: mass, p[n].x...

Homework Statement I am designing a physics simulation that models two balls colliding along a straight line path. I can change the coefficient of restitution, the initial velocities, and their masses. THe assignment asks that we vary at least three parameters, so in my case, the three are...

I do not quite get the argument that the GZK-Cutoff hints at the fact, that all of our universe is a Simulation. How does the fact, that according to the work of Silas R. Beane, Zohreh Davoudi und Martin J. Savage our reality has limits comparable to the resolution limits of a computer monitor...

I have a project where I need to simulate the magnetic forces with ANSYS. I'm and intermediate ANSYS user but I have really only worked with APDL, and if possible I would like to do it in the GUI. So my problem is that I have only ever done structural and thermal models in ANSYS. I am...

I would like to simulate the Physical Layer of the Controller Area Network(ISO 11898) to evaluate the performance of the system under varying conditions(Temperature, Twists/turn, Length, Termination type, Unfitting Node Terminations, Interconnections, Splices, Unbalanced Loading etc.) I will be...

Homework Statement I need to develop a macroscopic gravity simulation software. I have problems with representing vectors in a programming language (c++), because I need do develop my own mathematical infrastructure for the project. I asked for the Cartesian coordinates, but would also have...

Is there any software for simulating physical phenomena? I've googled it and found one named Physion. It is great for fun but is too limited. Would programming be the only way or is there some ready-made program that could provide an easy environment to develop simulations.

Hello, I'am studying a code (called "starscream") which allows to make initial conditions (positions and velocities) for NBody simulation. They are based on Springel and White (1999) model. I have several problems about the underlying equations used in this code. Firstly, See attachment...

Hello, I'm learning digital logic and design, I was told that I should use Quartus II, which so far works very well for me. Unfortunately, I noticed that simulating was eliminated on recent versions of Quartus II on the web edition. So, while new versions are better and I still prefer the...

Hello all, Background I've been playing with computer simulations quite a bit recently, and wrote one that crudely simulates the formation of star systems. My first version was a conventional many body simulation with about 300 small bodies; it actually tends to come up with convincing star...

Hello! I am having trouble using the SimPowerSystems library from simulink to simulate circuits (with the powergui solver). On all the circuits I have simulated so far either of the following happens: - Adding the initial current/voltage directly at the RLC branch block culminates into...

I have a twist for politics, and I wanted to explore some numerical simulations to compare government types and effectiveness in the use of available resources. I thinked about agent-base simulation, and later found (on Wikipedia) that this type of simulation is fairly common in treating...

I've tried out the two body problem and tried to work out the trajectories with respect to their center of mass frame(located at the origin) as follows (it worked!:smile:): particles = m1 and m2 Fm1 = force of m2 on m1 Fm2 = force of m1 on m2 a = Gm2\hat{r} / r2 \hat{r} is the unit vector...

I am doing an assignment for college, (though my question is more general, rather than based on questions I have been set, hence the reason this post not being in the homework forum). It is basic DC circuit analysis using, Kirchhoff, Thevenin and Norton theorems. Nothing taxing, so I know my...

Dear PF-ers (whats a thing right?), Alright as per previous experience, I ask what I'm looking for first, then explain (for those lazy readers): I am looking for some books/ebooks/sources specifically relating to simulation (Thermal) in Solidworks. I've gone through all videos on Youtube and...

EDIT: I'm not in my sharpest moment. I just found a bunch of posts that discuss this. I'll read them and update this post if I find an answer. I'm working on a hard-sphere MC simulation (for a class). I want to compute the radial distribution function g(r). To put you in context, as to my...

Homework Statement I'm trying to simulate the following circuit in OrCAD PSPICE. Homework Equations The Attempt at a Solution * 8.20 Vdd 1 0 5V MP1 3 2 1 1 PMOD MN1 3 2 0 0 NMOD MP2 4 3 1 1 PMOD MN2 4 3 0 0 NMOD R1 3 2 1000 C1 2 4 1uF .MODEL...

I was wondering if anyone knows of such a website or program whereby I can type a speed I would like to travel, and it will allow me to travel around the Earth or through the universe at that speed? Nothing like a flight simulator but just something that will allow me to control the speed the...

I'm currently working on a project for a code that does umbrella sampling of a 2-D Ising model [size LxL of a magnet (analyzing up or down spins)]. The next step is to take my code to analyze a nucleation region and its growth by varying the temperature above critical. Before I even attempt to...

The Canadian national men's curling competition (the Briar) is going on this weekend and I am motivated to write a computer program to simulate the motion of the rocks on the ice. I see on TV that the rectangular rink 14 by 126 feet appears to be trapezoidal on the screen, with the front about...

Hi I am working on a project at the moment and I was wondering if there is any circuit simulator that includes the PIC 18F4550 microcontroller. I currently use Crocodile Technology and I have tried editing the code to get the chip to just appear (I don't need it to do anything just sit there so...

Any suggestion or hints for any software that helps in Frequency Planning for Communication networks... please give links! thank you all.

Author: Mark Tuckerman Title: Statistical Mechanics: Theory and Molecular Simulation Amazon Link: https://www.amazon.com/dp/0198525265/?tag=pfamazon01-20

Hello, I have a little three-body (well n-body but let's just worry about 3 now) simulator. I input six Keplerian orbital elements (period P, eccentricity E, inclination I, longitude of the ascending node W, argument of periapse w and initial true anomaly f). They then get converted to...

Homework Statement Hi in response to my previous thread (principles behind the waveform selector circuit), I would now like to run a SPICE simulation using the PSPICE schematics software to obtain the theoretical values before entering my lab session. I have uploaded the schematic for your...

Homework Statement As the title says, I am trying to implement two differential equations into Simulink. I don't know how to start. How do I know what to start with, which block goes where? when do I add something and when do I know to subtract something using the sum block. When I got my...

Hello, I am a student from Germany and I stared my first project using ANSOFT Maxwell. I have read several tutorials and have a few questions how to simulate my problem. Hope I can find some help here. First my problem: I have two identical magnetic disks. These disks are so positioned...

Hi all. I have been working, off and on, on a Solar System simulator (in MS Excel) for many months. I am using the Runge-Kutta-Fehlberg 8/9 8th-order integrator and JPL's initial conditions to try to reproduce an accurate model of planetary motions. This, of course, involves modeling the...

Hello ,everybody I plan to develop a nuclear fuel cycle simulation software . Is there any body interesting it. I think this is a very complex project. :)

What's wrong with my circuit simulation? No gain is observed at the amplifier output. The intent is for the output gain of the 741 operational amplifier to be equal to R2/R1.

Can anybody please provide me any information on the LES, RANS and DNS? What is the basic vice of each and what are the differences? Why use one over the other? And additionally, are there any online lectures/videos that would help me understand the turbulence modelling methods better? Please...

Hi folks I would like to know maybe someone has some insight if you make a circuit in multisim (I have the 12 edition) and u go through everything then you run the simulation and it shows that all is ok and working like you thought it should what are the chances that multisim could be lying? I...

I am trying to perform a CFD simulation of a 70 degree sweep Delta Wing at different angles of attack (aoa = 20, 25, 30, 35 degrees). The inlet flow is at 25m/s. I have made a spherical Far-field boundary with the sphere radius of 5 times the root chord length of the delta wing. Because of the...

Hi all! I started learning about Monte Carlo Simulation. However, one thing that I don't quite get is that why for generating any random variable, we have to first generate a Uniform RV? What is the reason behind that? Thanks!

I am trying to model a thermal mass for a greenhouse design. A thermal mass is basically a box of mass with high Cp buried in the ground with the top exposed to the inside of the greenhouse and all the other sides insulated. My model is based on the fact that during the day, there is a net...

I'm looking for some event generator and detector simulation software. While I was searching, I found a lot of event generator software like PYTHIA, HERWIG, etc. But I was having difficulties in finding a software that will create a detector simulation. If you could tell me which event generator...

I have built the following circuit: http://i1226.photobucket.com/albums/ee410/jean28x/pspicemodel.jpg However, when I try to simulate it, I get an error that says "Simulation aborted because there are errors during netlisting. Please refer to the sessions log." What am I doing wrong? I'm new...

Hope you enjoy the following, http://www.youtube.com/watch?v=_Ssc1GsqHds&feature=player_embedded From, http://planetsave.com/2012/10/20/galaxies-trend-towards-more-ordered-disk-like-forms-over-time-upending-old-assumptions/

Hello. I wrote a simple gas simulation in python, with pygame. In the simulation the atoms collide elastic collisions with each other and with the walls. Although the simulation does run and the collisions look realistic, when I try to calculate physical parameters like p,T,V,n and compare them...

Hello I wrote a simple simulation of an 2D ideal gas, with elastic collisions. I wonder how should I simulate the pressure that is implemented on the particles in the box, by a piston with certain weight. it's easy to adjust the area of the box and the temperature of the particles which is...

I have worked with softwares that help me simulate circuits (Hpice, Proteus, MultiSim), but is there a software that helps me simulate devices right from the level of the atom? For instance, I should be able to create a pattern of boron with silicon atoms, and then be able to replicate it 1...

Hello. I am currently a student at UCF in Orlando, FL. Simulation and modelling are big things around here. I have the opportunity to get my master's degree paid for by the lab I work in. I'm not terribly excited to stay here for another two years, but I really don't want to get a master's if I...

Hello, I'm trying to simulate disc galaxy dynamics with a nbody code. The main problem is to get good initial values (positions and velocities of each star) in order to reproduce the experimental dynamics. For the positions, I began by generating a gaussian distribution of stars on 0x...

Hi I built with Python a simulation of an ideal gas in 2D, treating the molecules as hard spheres with elastic collisions. I am trying to test the experimental values of P,T etc. in the simulation versus the theoretical values. however, I have two problems: 1) when comparing the pressure...