Simulation Definition and 899 Threads

~Radioactive decay simulation Homework Statement i have modeled a simulation of radioactive decay and am using an exponential model of y = Ae^kx and I am asking to analyse my model and justify my choice of model. and points I can discuss are relating the solution to the problem and...

Hi! I am wondering if anyone here knows of a generic heat engine simulator. I.e. something that can simulate the behavior of reciprocating engines, Stirling engines, and so forth. The outputs I'm interested in include things like power and efficiency. The input variables that I would play...

Suppose a company has developed a modification for almost all types of tanks such that when the tank is filled with an incoming fluid (which is at a certain pressure), it stores this pressure and uses it to take the fluid out of the tank with pressure, i.e even if the tank is at low altitude it...

I'm currently writing my own physics simulation engine for some practice with physics since I plan on taking it as my major along with computer science and would like to be ahead of the curve. Plus I'm just plain interested in it. I've read through some papers such as...

Dear Friends ! I would really need Your help. I am currently simulating the temporal development of an interface between liquid and gas, by using Comsol Multiphysics. The problem can be simplified in terms of a rotating central liquid pick up (a small rotating cylinder endowed with an...

referring to: 0:59 factors: - you are on a 100 meter track - person A walks towards you - person A takes a 1 meter step every second - track grows longer as person A walks - track grows 1 meter for every 100 meters every second - after 10 seconds, the walker has taken 10 steps...

Best software? :smile:Can you pls tell me which is the best software for circuit simultion and analysis,etc...:smile:

Dear Expertor, I'm just newbie in Comsol program, I have project to simulation the infrared radiation heat for the epoxy. So i would like to know how to specific the infrared lamp in Comsol simulation model. Could you please reccomment some book or some sample file of Comsol. Thanks...

Hii, I am an electrical engineer but I feel myself too weak when I try to solve the problem. I am trying to simulate an artificial experiment which is: Let's place a gold piece which is about 10x10x10cm. Let's place it to the bottom of a pool and fillet with a liquid with which the...

hi there, Im currently working with the program nextnano3. It's a really nice program with which you can simulate nanowires, dots etc. I currently made a sample of an InP nanowire, with 3 sided gates at the bottom of the wire. These don't touch the wire (10nm between them and the wire) on...

Free download flash physics simulation from http://janggeng.blogspot.com" engine : action script 2.0 file type : swf available now :Virtual Microscope Simulation, Simple Pendulum Simulation, Mixed Reflection Simulation, Isobaric Simulation and more... visit me at http://janggeng.blogspot.com

I would like to simulate a gas--very approximately--in 2 dimensions. The container will be divided into a grid, and instead of keeping track of each molecule of gas individually, I want to let each cell in the grid have a value for the number of particles in that cell, and another couple of...

I want to simulate some "ants" on a computer, as a cellular automaton. I'm not going for realism, but I want to capture the ability of ants to find paths between nests and food sources, using pheremone information (stigmergy), and purely _local_ observations. I've been working on a program for...

Looking for feedback on a simulation I created to show how using a displacement field can be used for simulating gravity on a large and small scale. http://www.kademco.com/psim/psim.html Click multiple times to create points of mass. Each point you add "pinches" the field. There are no...

Matlab 2-D Simulation for TLI (Trans Lunar Injection) "Basic Orbital Mechanics" Hi Everyone, I have been assigned a project in which I am to program in MATLAB the solution to the 3-body problem, but in 2-D with a couple assumptions. 1) Earth and Moon are stationary. 2) Mass of spaceship...

Hey Quick question. I am trying to model creap in an FEA or similar package, but what package should i be using and how complex is this? I am using just a BS Lead Test Piece, which does lead me to ask - Does anyone know the standard dimensions of a test piece, i was using lead, and can...

hi, i try to build a simulation of an object in 3d space. the object is point object with properties like this: p : current position of an object. v : current velocity of an object. f : current force applied on an object. m : object's mass (1 kg) dt : time elapsed since previous step...

this is a optically pumped VCSEL rate equation... ##have to write one editor function dy = qwer(t,y) dy = zeros(2,1); h=6.62e-34; %plank's constant c=3e10; % speed of light La=42e-7; %active layer thickness Ap=154e-10; %pumped area lamda_p=1310e-7; % pump wavelength eta_abs=...

hi my friends. i want a flash format file that simulated the stone skipping.(or other format like 3dmax, maya,...).is there anybody help me? thanks a lot. ashkan

Trying to simulate leakage current, say from a reverse bias diode or even a dirty PCB. Getting funny results using the current source across the load. Anyone have any ideas. Basic voltage divider fed by CV source and a 1uA forward biased CC source across the VD tap. By the way, I'm fairly new...

hello there I'm using comsol multiphysics acoustic module. so: 1) acoustic model / pressure acoustics / time harmonic analysis 2) draw a circle and do boundaries (F7) = radiation condition (p=0) so this boundary absorbs all the acoustic pressure... 3) then made a mark in the middle and...

hello... Can anyone tell me how can I simulate the laser rate equation with matlab? i allready wrote a code whics is as follows, %have to write one editor function dy=rate_equation(t,y) dy = zeros(2,1); I =50e-3; %for t=1:10; q =1.602e-19; v =9e-11; eps =3.4e-17; N0 =1.8e-18...

In my high school Honors Chemistry course today, we performed a simulation (along with several real labs) of chemical (dynamic) equilibriums. I'll briefly outline the simulation: 1. Place 42 pennies on the reactants side and 0 on the products side. 2. In the first round, move 1/3 of the...

Homework Statement Hello all, this is my first post here although I've used this site for referencing several times. My question is regarding an 8:1 multiplexer. I need to write a c program using just &&, || and ! to simulate each gate of an 8:1 mux. We have 3 control inputs and 8 source...

I mean, why there are so many speculations? It must be 'shut up and press enter' :) For example, some people say that the second horizon in the Kerr black hole is not dangerous. Others claim that due to infinite concentration of energy there there is a real singularity there so everything...

Dear all, I have some problems with a program called the simulation of laser interaction with materials. In this program, they asked for some parameters which I am unsure of but I believe it has something to do with space grid for simulating the thermal conduction. This is a 1D heat...

hi friends, I'm going to simulate the spectrum of a specific ion, with constant situation (like: density, temperature and etc). but I don't know what should I do first! thanks for your help :frown:

Hello, I am attempting to build a single axis inverted pendulum using a PID system to keep the rod balanced. I am interested in writing a program to simulate the rod tipping over and the effects of moving the base (pivot point) left or right to counter the tipping effect. I can't quite...

Man, I just found this video on youtube and the 3D effect is absolutely amazing... imagine playing a 3D shooting game with that! Furthermore, the effect can be done with very low cost as demonstrated in the video... here is the video https://www.youtube.com/watch?v=Jd3-eiid-Uw

it is interesting i could not find many particle-particle simulators that simulate electrical fields even thought dynamics is pretty similar to that of planetary orbitals. there are few i could find but they are mostly 2D and defining problem in mathematical/geometrical terms, with sin/cos or...

I am attempting to simulate the 4017 chip in multisim but I am not getting the expected result. I doubt that multisim is incorrectly simulating the chip, so I think that I am probably just hooking it up incorrectly. http://www.doctronics.co.uk/4017.htm"...

Greetings to all I apologise if this has already come up before, I found many related topics on these forums but nothing dealing with my specific problem (providing it is due to a physics error and not a programming one). I'm currently in the midst of programming the physics part of a...

I want to advect a surface using the fluid velocity using semi lagrangian advection. The fluid is in a box, that is the fluid is surrounded by solid walls in 4 directions. I applied "no slip boundary condition" for fluid and neuman boundary condition for pressure. But the problem is that my...

Hi Guys, I need to design something that will isolate our DAQ (Data Acquisition Card) for a basic simulation we need to do. I was thinking about designing a mosfet switch, where the DAQ sends some voltage to the gate above the threshold voltage to turn the MOSFET on and 0 V to turn it off...

Hi Does someone have successful experience working with GNU/open source circuit simulation tools in Linux? I tried gEDA, but it did not work well for me. If you've been successful in using such software, please write back with detailed experiences here. I use Microcap for my undergraduate...

Hi I am working on a project to do a coil simulation using COMSOL to determine inductance and resistance variations with frequency. I have a CAD file for the geometry but I need help because I am having serious difficulties with the rest. Can anyone help pls? thanks alot

Hi, I have a little problem. I recently got the nerve to try and teach myself all of the physical properties necessary to program a physics engine (the insomnia is a DIFFERENT problem). It's going much better than I could've hoped (considering I started a few days ago). My knowledge of physics...

Homework Statement http://img399.imageshack.us/img399/4277/cartyf8.jpg http://g.imageshack.us/img399/cartyf8.jpg/1/ Homework Equations Euler's Method, Runge Kutta 4th Order Method The Attempt at a Solution I have solved the motion equation for the above question using Euler's Method and...

Hello, I am trying to implement a simple simulation of a point mass connected to a linear and to an angular spring. I thought this would be very easy, basically just integrating these two equations: mr''=-k_l(r-L)-c_lr' m\theta''=-k_a(\theta-\alpha)-c_a\theta' These are in polar...

Hi, I wonder if there is a Density Functional Theory or Hartree-Fock Theory based atomistic simulator that can be used to simulate nanoelectronic devices for example nano-scale field effect transistors? I looked at the documentations of SIESTA and other DFT software listed at...

hi, I am preety new in this field so I need some help about Comsol sw. I would like to perform a simulation but as I am not a physicist I have no idea how to. So, if anyone can help me, I would be very happy. OK. I would like to simulate the drop of liquid(water) which falls into a liquid...

Does anyone know how to simulate the pulse laser drilling? I am trying to use Comsol or MATLAB to simulate the laser interaction with a specified piece of material. Following, plot the time (X axis) versus temperature (Y axis) diagram to see the temperature distribution. Any help in...

Hi, I am a computer science student in my final year, and preparing myself for my graduation project (GP). Please check this video: http://www.youtube.com/watch?v=d7eGypGOlOc" This program is from MIT and it is called "A Shrewd Sketch Interpretation and Simulation Tool". I am planning...

I have a simple circuit 2v supply R and Diode in Pspice that I'm trying to run a simulation on. I get the following message. "This action cannot be completed because the other program is busy. Choose 'Switch To' to activate the busy program and correct the problem." I have no idea what the...

Hi everyone, Does anyone know what simulation software to learn fundamentals of fluid mechanics for beginner student of mechanical engineering like I can create it by my own? Thanks in advance Huygen

I posted this topic in a physics forum on another web site, but I thought this forum might be a better place to get good answers. So the other week, I tried writing an applet (using the new Javascript Canvas Firefox now supports) to simulate a thought experiment I use to explain the basics of...

Hi to all, I've been around this forum for some time now, but this is the first time I actually registered in need to ask you for some help to crack this. I've seen some great minds who surely could give me some lights. Thanks to all :) Homework Statement So, um trying to create a numerical...

I am looking for a way to evolve a wave function in one dimension. I tried searching already but couldn't find anything. Basically I have: V[x] gives the potential at x Psi0[x] gives initial conditions on wave function for each x I would like to calculate Psi[t,x], the wave function at...

So I have been further researching possible career paths with a degree in math that would suit me, and I came across the idea of modeling and simulation for national defense (for example...

Hi, Everyone. I am new to electronics in general so I have a rather uninformed question. It seems that a lot of circuits out there are presented "as is" without necessary mathematical calculations. When I took my physics, we were taught KCL, KVL, RLC etc. I enjoy deriving circuit behavior...