Simulation Definition and 899 Threads

Homework Statement Hello, I am trying to simulate the heat diffusion from a laser beam striking a sample. My model/concept is very simple in that it assumes the temperature distribution will be a radially symetric sphere (i.e T=T(r,t)). I would like to plot a temperature profile evolving...

Hi, I've been busy in designing some circuits and I want to simulate some non linear behavior of transistors and diode circuits. I want to find a free simulation program. Does LT Spice work on these discrete components? Thanks Alan

Hello I need to do some simulations before trying to make a real circuit. I was advised to use the free software by Linear Technology. However, it works bad. I have a circuit with a couple of operational amplifiers(op-amp). According to the first golden rule, an op-amp should keep equal...

Homework Statement i need to model the wind in a computer program. it is for a wind turbine model and I can use wind data that I have found on the internet, however I would prefer to see if I could model the wind using the weibull distribution and add on the kaimal spectrum if possible. The...

Hey All, Have any of you ever worked with thermal software such as Flixo and Therm? I'm having a problem with U-Value calculations differing between the two programs, and I would really liek to get to the bottom of why. What I'm thinking: I am coming up with some ideas based on some...

i haven't clicked on it. better safe than sorry.:smile: if it is somebody ought to remove it. Have A Nice Day!

Dear All, I started to look around for a reliable definition of the differences between Calculation, Computation and Simulation, but I'm not satisfied with what I've found. In your view, what are the correct usages of these terms? When something becomes more than a computation or calculation...

I have to admit I'm a newbie to this forum. My background is computer graphics and physics simulation. I'm not a student but have 20 years of professional experience and an academic background (phd). Here some realtime inteactive physics simulations that may be interesting to you. Could...

Hi all, As part of my Final Year Project I am studying the feasibility of domestic seasonal thermal storage in water tanks. I am hoping to model this system and have been looking at the TRNSYS software for doing so. I know that this is possible to do because I have seen a number of studies in...

Is there a simulation software capable of simulating the effects of magnetic and electric fields like the current iduced in a loop because of a changing flux? thanks

Hello to all, as i saw the forum and all the posts i hope i come to the right place. I don't know much about physics, but reading and looking throw the physics files i managed to a bit understand how things works. Now i am try to make a car physics for the old rally simulation Richard Burns...

Hi, all. I'm wondering if anyone's done some simulation of magnetic material with LLG equation. The question is where can I find the value of exchange constant for a material. In LLG equation, the exchange constant is in the unit of "J/m", and the typical value is 10^-11 J/m, for some...

Hello everyone! :) This is my first post in this forum! :) I am a computer programmer but the last weeks I am trying to combine my field with astronomy and astrophysics. I decided to create my own nBody simulator but I have problems understanding the calculation of the velocity and speed...

Homework Statement I am making a standard N-body simulation for a computer science class and, for some reason, the objects that I am simulating accelerate past each other, and then engage in spring-like motion, getting closer and then farther apart, etc. Obviously incorrect. Homework...

In school we have to make a theoretical circuit using a simulator, in our case its CircuitWizard2. For this project we need to think up a problem and then create a virtual circuit that solves this problem. Throughout we have to show our calculations, testing and development of ideas. We...

Hi, I am trying to do a simulation for the current distribution in a cylindrical conductor wire using MAXWELL 3D. I used eddy current solver and assigned excitation of current 1A at both ends of the round wire. (I set length L=2mm, radius R=1mm) The field plot seems ok, having highest current...

Hi everyone, I am hoping that someone may be able to advise me on an issue i currently have. I am trying to implement a Physics computer simulation (only basic) designed for children learning about forces. One of the sub games that i have created is to fire a character from a cannon and find...

Hello, I am hoping someone can give me a little bit of help. I have been simulating a CMOS inverter circuit. When I add in a pulse source at the input, and simulate it, I get an output which has a bit of a spikle on the transition. I am hoping someone can help my understand why this is...

hi, i m an undergraduate student an my final semester project is to develop a simulator for hydraulic system in any software. in simple words i want to model the system and show fluid flow through pipes. anybody can please help me?/

Can someone explain to me how fluids are simulated using particles? What equations to solve? How to update the particle positions? How awfully computer intensive is the algorithm? Can a simulation using a 100 * 100 * 10 grid run okay on the average computer? The more I read the more I realize...

I was just wondering if anyone knew of software that would allow me to simulate magnetic induction. I'm researching into the effects distance and the number of windings has on the effect of transfer efficiency between two coils. I've seen lots of people mention Maxwell, but they seem to...

Hi, I have a question/doubt/general-lack-of-understanding here: I have a simulated solar system here, with simplified orbital mechanics. The main simplification is that at anyone time, only one celestial body exerts gravitational forces on the spaceship. So, my problem is: What would be the...

Hello, I want to write an earthquake simulation for one of my programming classes and wanted to know where to look to get started understanding some of the forces and other properties of earthquakes. This is for a video game physics class so it doesn't have to be super accurate the class is...

Hello again. Still trying my hand at a physics simulation, as I've been re-learning a lot of forgotten physics and math in my journey! Been stuck on this problem for a few days now though, and thought I'd consult the experts! I'm probably missing something obvious, and the solution is...

Hi all, I need to use some numerical simulation programs. The source code is provided in Fortran 90 but I'm not able to compile it. I'm using G95 complier on WinXP, and the code are avilable at the following address: http://www2.fz-juelich.de/jsc/splim/ Could you provide any step by...

Hello, everybody. I have been actually afraid of posting this thread, because I usually lack in time (you know I have to work to survive), and as far as I know philosophical threads tend to be really long and complex. I consider myself as a layman when it comes to philosophy, so I hope I won't...

peace be upon you: i am working in design i have finished drawings using sloidworks and about to do simulation and i need advice which is better ansys or SW simulaion hint : i need accurate results to do optimization for design in the future thx in advance

I work for a company that manufactures and sells night vision scopes, day time optics, lasers, and pretty much anything that mounts to a weapon. I wanted to test our equipment to see how well it holds up to various recoil of different weapons but ammunition is very expensive and it is very...

Hi all, I am seeking for an optical design an simulation platform. There will be splitters, combiners and mirrors with precisely adjusted angles/positions. I will input the specs and position of all the components (including the light source) and want to view the corresponding optical path...

Hi, I am currently working on a computer simulation of free falling objects with air resistance..and I am having problems computing for air resistance..can you give me the formula on how to compute it and an example please?..thank you :))

I'm writing a physics simulation/game in java applets, I have a quick question about collision detection. DISCLAIMER: I am not a math or a CS major, so this is probably a ridiculously easy question for most people on here: My question regards speed when there are lots of objects. Right now...

Hello, I like to share with you a virtual lab with Oscilloscope tool. Here you go: http://www.dcaclab.com/en/lab/ and here is an example...

https://www.youtube.com/watch?v=VQBzdcFkB7w Reference: http://www.ibtimes.com/articles/206146/20110830/milky-way-galaxy-model-eris-supercomputer-spiral-galaxy-simulation.htm"

Homework Statement Hi, I am trying to simulate a LISN circuit, using a 220V/50Hz as Line input, a signal generator as SMPS equipment emission. The circuit is as below: And then I have this error and the box comes out Homework Equations The Attempt at a Solution I am trying...

I am trying to simulate the attatched code for pic18f550 in proteus.Pin 20 of the port D is supposed to toggle after some time delay.Now when I try to simulate, proteus gives an error related to clock frequency, which can be set in the edit dialogue box. Now,i don't know much about...

I want to create a computer simulation of the Space Elevator, simulating if different materials would be able to handle the tension, and whether the whole thing would be able to function efficiently through the gravitational field. Anyone how I can go about doing this, and what software to...

Does anyone know of any simple aerodynamics simulators? Preferably one that would allow me to import a 3D model and then calculate its drag coefficient? I have done a few searches, but failed to find much of anything. Oh, and it needs to be free. Not part of some mutli-hundred dollar...

I tried to solve a simple transmision line circuit using MATLAB simpower system In this image, Ac source is 132 kv. I want to read rms value at the load. But unfortunately, the simulation is running very slow, and it is taking forever to even comple the one ac cycle. Any help please.

I have a basic understanding of Grover's algorithm, and I do know it searches through an unstructured database for some value. I recently downloaded the Quantum Processing Simulation (QPS), and after trying out the Grover simulator I became confused: through what database is it searching? It...

I'm looking for a simulator for magnetism and fluid dynamics(with the objective of modeling atmospheric reentry), and was wondering if anyone knew of one(preferably free/open source). If anyone feels like searching(I couldn't find anything) the field is called magnetohydrodynamics. In the...

I'm building a code for Molecular dynamics (in C). I'm employing Lennard Jones Potential, periodic border conditions and I integrate Newton's equations by making use of Verlet Integration. When I plot Time vs Energy graph, what I get isn't a constant! but when border condition are remove, then...

I am trying to simulate a single rectangular body but I am having issues with Torque. I have an angular velocity variable (AngVel) and I have my torque calculations (Torque = Vertice:cross(Impulse)) and I get the angular acceleration (AngAccel = Torque/Inertia). The problem is that, from what I...

I am trying to model a simple birth and death process in Mathematica using the Gillespie Algorithm. I am using 1 DNA molecule that is transcribed to mRNA with rate k1, \mbox{DNA} \longrightarrow \mbox{DNA + RNA} and the transcribed RNA are subject to degradation with rate k2...

Hi. I don't know if this is the correct place to ask this, but prefer you to suggest me where I should ask. I'm starting with numerical simulation and I've been playing with the finite differences method to solve the heat equation on 1D, 2D and 3D uniform grids. This was really simple. Now I...

Just wondering how I can manipulate this script to give an estimate for (b). For reading purposes, here's the whole question. 3. Suppose there are 50 memory chips in a box, of which 40 are "good" and 10 are "bad." We withdraw four of the 50 chips at random to upgrade a computer. (a) What is...

I will try to be brief, so please bear with me! I have a Matlab program which simulates a particle's movement over time in a certain ocean. The details of this implementation aren't really important, but basically I create about ~300 particles near each other and place them at a certain...

https://www.youtube.com/watch?v=5qyhLAsVxlU I have been considering a concept that is beyond my technical qualifications. I want to start development of a software project that is based upon some convergent concepts, and I am requesting collaboration in writing a scientific paper on the...

I don't know how to solve the questions that my lecturer gave me. I not understand about probability of half life. Can anyone explain to me and help me solve the questions as well? My lecturer ask us to prove the probability as shown in the picture.

Every time I try to find frequency on this problem I get the same answer - and according to the simulation it is incorrect. Here's a picture of the simulation. Please note: I am just trying to find frequency. I know the other two variables (.6A and 6V ; these are confirmed correct)...

I've coded a physics simulator that simulates the solar system. Essentially it just calculates gravity between bodies and attracts them together, the most basic simulation. But obviously just feeding in positions for the sun and the planets will just have them all fall into directly each other...