Simulation Definition and 899 Threads

  1. F

    How to Generate Accurate Initial Conditions for Simulating Galaxy Dynamics?

    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...
  2. L

    Ideal Gas Simulation: Troubleshooting Pressure and Gas Constant in 2D Model

    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...
  3. N

    How to handle simultaneous particles collision in simulation?

    Suppose there are 3 balls colliding at the same time. I find that the order in which I resolve collisions makes a difference in the final result, which ofcourse makes no sense. To explain and keep things simple, consider 3 balls in 1D, all same mass, elastic collision. The numbers at the top...
  4. M

    Simulation of a GSHP system in Simulink

    Hello kind people of PF, I'm working on a project and attempting to simulate a ground source heat pump system in simulink. I have no experience what so ever with MATLAB or simulink, which isn't helping. Does anybody here have any experience of modelling such systems in this environment...
  5. M

    Simulation, Geometry & Mesh Creation: Tool Suggestions & System Requirements

    Hi Guys, I have an query. I would like to know the best tool for Simulation, Geomtry and Mesh creation. I want to simulate a duct with a turbine in it as a Part of my research project. I am beginner for the simualtion field so please suggest accordingly the appropriate software. Also please...
  6. W

    Monte-Carlo simulation Coulomb potential scattering

    Dear all, I just started learning about the Monte-Carlo methods of simulating particle interactions. I would like to ask a question about simulating potential scattering. In particular I think that the simulating scattering by Coulomb potential, and writing a corresponding MC test program might...
  7. B

    Question about a monte carlo simulation of car travel patterns

    Hi there, I have a question about probability, conditional expectations, copula functions and their use in a Monte carlo simulation. I'd appreciate any help or comments that you can offer. I'll describe briefly what I am trying to simulate and I'll ask the specific question at the end...
  8. G

    Computer simulation of geologic processes using multidimensional functions

    Hello all, this is my first topic here at PF, though I have been using this site as a homework aid for quite a while. Just to clarify, this problem is NOT a homework problem. I have been attempting to create a MOD for the 3D lego-like indy game called minecraft. Minecraft features a...
  9. G

    Particle Beam Simulation Service

    Are there any labs or private companies that can run particle beam simulations for a fee? If there are, any suggestions how to find them? thanks..
  10. T

    Blast Simulation: FSI vs Load as Pressure

    Hi all, Planning to do an Blast simulation on a vehicle. Should I go for FSI or Use the load as pressure. Please throw some light on the same. Thank you, TheSymbol
  11. B

    I am making a big assumption but if we live in a simulation

    I am making a big assumption but if we live in a simulation... ...Would the real world affect are world the virtual world because of the double slit experiment? Would an outside observer of the simulation or a object outside the simulation or even the computer that the simulation built on have...
  12. H

    Atomic velocities from forces and MgO simulation

    I've attached a graph of the pair potential between Mg and O. The peak attractive force experienced between the atoms is 1.6 eV, or 10^-19 Joules. From F=ma, with an O mass of 2.66*10^-26 kg the acceleration experienced by the atom is about 9650000 m/s^2, or 9.65 nm/fs (nanometers per...
  13. I

    Is There a Software for Simulating Capillarity Action in Various Shaped Tubes?

    hi i need a software that allow me to test capillarity action in different shaped capillarity tubes please advise me
  14. W

    Ngspice Capacitor Simulation problem

    I intend to use circuit simulation (namely ngspice because it runs on linux) to aid me through electric circuit studies. However, I recently encountered a problem in a circuit I was simulating: the plots were not logical - a capacitor was taking no time to reach its maximum voltage. At...
  15. D

    Finite element simulation of a solenoid

    Hi all. I would like to do a finite element simulation of a coil in a time-varying magnetic field, to see how much current is induced in the coil, and also to see how the coil itself affects its surroundings. Now my question is, how do I model a coil with several thousand turns in a practical...
  16. S

    Best Circuit simulation Software?

    I recently downloaded LTSpice IV to use for testing circuits. Before I start to really learn the software I'd like to know if it's what I should be using or if there's something better. Basically I'm just testing simple circuits, but I do need the software to have a virtual oscilloscope.
  17. L

    Bushing Joint simulation in Ansys W14

    Is it possible to simulate a bushing joint between to parts that would also conduct heat from one part to another?
  18. W

    How Can I Simulate Neutron Transport in Geant 4?

    Dear all, I just started using geant 4 to simulate neutron transport in the air considering three different types of collisions: elastic collision, inelastic collision, and neutron capture. Is there any similar examples in Geant 4 that I can refer to and play with? I know this is not a so...
  19. S

    Residual stress - Ansys welding simulation

    Hello, first of all I apologize if there is already a topic with this solution but this is my first time here, and I'm a little lost :frown: I'm developing a work which consists in the determination of residual stresses due to TIG welding. I have developed the model and ran a successful...
  20. reddvoid

    Investigating Unexpected Voltage in PSPICE Simulation

    This is the snap shot i took from Pspice simulation I have a doubt here ***why is voltage at non inverting terminal is 13.77V even though i connected 5V dc source to it and why the voltages at inverting and non inverting terminals are not almost same ( which we consider while solving opamp...
  21. T

    Those moving near speed of light simulation videos

    Those "moving near speed of light simulation" videos Lowly undergrad here. Have you people seen these relativity simulation videos? http://youtu.be/bYdohPiFF6Y for example. My question is, what causes this spherical distortion effect? I know about length contraction and time dilation, but...
  22. P

    Simulation Programming: Spawning particles at random position

    Hi, I am making a program with the simulation software Breve. It codes in Python or in Steve (their own language). In my simulation, spherical particle with random radius are being spawned at random position into a little zone. My problem is that those particle cannot be superposed. I don't know...
  23. N

    Direct Simulation Monte Carlo(DSMC) corner boundary problem

    Hello, I'm developing the DSMC code of 3d box(for test, no velocity, just applying the thermal boundary condition of 273 K). If there are diffuse boundary only up and down and others are periodic, simulation result is good. But if diffuse boundary is at all plane, wrong result has come...
  24. P

    MD simulation of amyloid beta dimer using GROMACS

    Hello, I am very new to GROMACS and needed some help with simple MD simulations. I have amyloid beta peptide (pdb code 1IYT) monomer that I need to place side by side in a water box, energy minimize and run the simulation. I have problems putting them together and creating the new necessary...
  25. M

    What are some tips for improving accuracy in shallow water flow simulations?

    I'm trying to create a simulation of shallow water flow and I keep getting huge values of variables. Does anyone here have experience with this type of computer simulations?
  26. F

    Simulation of beta-binomial distribution

    Hi all! I'm trying to solve the following problem. The number of successes in a sequence of N yes/no experiments (i.e., N Bernoulli trials), each of which yields success with probability p, is given by the well-known binomial distribution. This is true if the success probability p is...
  27. S

    Engineering Is the Simulation Accurate? Analyzing an Op Amp Circuit with Multisim

    hi everyone , i solved a textbook question which says : http://img268.imageshack.us/img268/8994/img1379sa.jpg http://img685.imageshack.us/img685/3228/img1380z.jpg and found analytically : ia = -470 uA, ib = 770 uA , ic = 22 uA, ig= 322 uA, is = 64.5 uA Ra= 1kohms, Rb=2kohms, Rc...
  28. S

    Torsion Test Simulation: Understanding Von Mises Criteria and Its Approximations

    Hi all, I am simulating torsion tests (after being successful with tension and compression tests). For tension and compression, I got a good comparsion with experimental and behaviour in tension is same as in compression (of course leaving the necking part). For torsion tests, I have...
  29. R

    Runge-Kutta for gravitational N-Body simulation - prediction of acceleration

    Runge-Kutta for gravitational N-Body simulation - "prediction" of acceleration Hey! I'm Raph, as you can see this is my first post, so, thus I'll start saying that it's nice to be here ;). I've got the following question: I'm simulating a system of N gravitationally interacting objects...
  30. A

    Exploring the Basics of Numerical Simulations for Modeling GRBs

    I intend to learn numerical simulations of collapsing stars. Could you suggest me some useful resources? i am familiar with matlab.
  31. T

    Theoretical, Experimental, Simulation, and end of story?

    Theoretical, Experimental, Simulation, and... end of story? I know that this question cannot be answered with any absolute authority, but I'd still like to hear some speculation. Can there be a next frontier in the tools of science? Previously, we had experiments and theory. Later...
  32. S

    Simulink Simulation of Inverted Pendulum: Help Needed

    I hope this is the right place to post. I am trying to simulate an inverted pendulum as seen in the picture using simulink, it is supposed to balance by applying momentum with a DC-motor. I have used the equation in the picture to make the block diagram and the result of the running the...
  33. M

    General/complete physics simulation software?

    Is there a complete physics simulator that I can use to do lots of things while I learn physics? For example, I just learned about barymeters. It would be very interesting to simulate one. It could be done setting up a small atmosphere filled with a gas, the glass model and the liquid. Some time...
  34. J

    Help with simulation in ANSYS Maxwell, 3D electromagnetism simulator

    Hello, I'm currently conducting a very serious high school research project titled: Maximizing Energy Efficiency of a Linear Electromagnetic Accelerator I have recently been bestowed with a temporary license for a very advanced 3-dimensional electromagnetism simulator that should allow me...
  35. S

    Is the wilson loop always positive in the lattice simulation?

    More precisely, my question is, Is the wilson loop used to calculate the heavy quark potential always positive in the lattice simulation? (i) as we are usually told, wilson loops of the following form are related with the heavy quark potentials ......... _________ <WC_______... |......|../\ ...
  36. S

    Is the wilson plaue always positive in the lattice simulation?

    More precisely, my question is, Is the wilson loop used to calculate the heavy quark potential always positive in the lattice simulation? (i) as we are usually told, wilson loops of the following form are related with the heavy quark potentials ......... _________ <WC_______... |......|../\ ...
  37. MathWarrior

    Programs Scientific Computing / Simulation and Modeling Degrees?

    I just was wondering if anyone here has pursued a degree in scientific computing / high performance computing / computational simulation and modeling, type of degree. For example Georgia Tech's Computational Science and Engineering degree or Computational and Mathematical Engineering degree, or...
  38. A

    Really Simple PSPICE simulation, need somebody to double check me

    Hi, I am working on a prelab for my electronics laboratory course. It's really simple (or at least should be. Basically he wants us to simulate the I-V characteristics of a D1N4002 diode. There is no resistor in the circuit we are to simulate (basically we're shorting it if you consider the...
  39. K

    (Electric) Circuit simulation software for blood flow model

    Hey guys! I am working on a simulation of a brain blood flow model. Instead of programming something on my own, I wanted to check first whether there are any electric circuit programs that could do the job. I am using the flow-circuit/electric circuit analogy...
  40. C

    Engineering Computer Engineer going into Simulation and Modelling

    Hey all. I feel as if I've dug myself into a dead end and I'd appreciate some career advice. I'm a senior computer engineering student with a 3.8 GPA at a decent engineering school. I chose the major to further understand the mysteries of computers. I enjoyed learning what I did, because now I...
  41. T

    Silvaco IC simulation with Athena Atlas

    I have a question about silvaco athena && atlas simulation, MOS structure, when I gate length is 0.6um, get Vth is 1.8V, but I only change gate length to 0.55um, get Vth is 1.6V, it's a error data I know, but I do not know why, what wrong with the program, how can I change it. would you please...
  42. N

    Ask about simulation using pspice

    Homework Statement Simulate the circuit from 10Hz to 10MHz. Produce the Bode Plot for the amplifier output (across RL). From the Bode plot, determine the following: i) Maximum gain, A(max) ii) The cut-off frequency, fc. iii) The frequency at the unity gain. 2. The attempt at a...
  43. F

    Magnetic Pendulum Mathematica Simulation

    Homework Statement This is for a lab, which I'm working on at home. There are two parts: using Mathematica to simulate a magnetic pendulum with 3 magnets by plotting the path of the bob and then extend my code to determine where the bob endpoint for all starting positions and draw the fractal...
  44. C

    Need bending machine simulation software and where to start to make it?

    I am doing my internship in the factory produce pipe, kabel for automotive. We get one project from user to make a bended pipe... So far we bend it manually using some torsion tool and operated by human... The tug time is so high so we plan to make the machine if the cost is coverable...
  45. S

    Simulation, distribution, statistics.

    I´m wondering how to find out something about distribution functions after I´ve calculated the scewness. I have 15 numbers, mean is 3.206, highest is 7.028 and lowest is 0.9209. Variance is 2.958195. I calculate the skewness and got 0.945. I´m wondering which of the following distributions is...
  46. B

    3D model with wind tunnel-CFD simulation

    Hello, i am Fluent beginner..im doing thesis about aerodynamics on solar race car.. have to study about its drag and lift coeeficient.. i need help about how to 3D mesh the car and the wind tunnel.. now i have draw the car model as one part and the big square as wind tunnel as another...
  47. N

    Developing Direct Simulation Monte Carlo and I have problem

    Please understand my low command of English. I'm developing Direct Simulation Monte Carlo and I'm now validating. To validate my DSMC code, I'm checking the viscosity in Couette Flow. Simulation Condition is, Kn = 0.0056(Near Continuum) and Gas is Nitrogen, Temperature is 273K. Nitrogen...
  48. E

    Implementing a function in simulink simulation

    Homework Statement The problem statement essentially has me inputing a signal into simulink manipulating it and then looking at the output. My output function is defined as $$y(n)=0.8x(n)+0.5x(n-1)+0.2x(n-2)$$ Homework Equations N/A The Attempt at a Solution In my simulink...
  49. E

    Why is my N-Body Simulation in Matlab Showing Errors?

    Hello all. I'm currently writing a program in Matlab that works out the positions of N bodies under the influence of gravity. The code is setup such that it only requires a mass and an initial position and velocity for each body. Any number of bodies can be entered but for testing purposes I am...
  50. J

    Simple circuit simulation applet

    http://www.falstad.com/circuit/
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