What is Simulation: Definition and 879 Discussions

A simulation is the imitation of the operation of a real-world process or system over time. Simulations require the use of models; the model represents the key characteristics or behaviors of the selected system or process, whereas the simulation represents the evolution of the model over time. Often, computers are used to execute the simulation.
Simulation is used in many contexts, such as simulation of technology for performance tuning or optimizing, safety engineering, testing, training, education, and video games. Simulation is also used with scientific modelling of natural systems or human systems to gain insight into their functioning, as in economics. Simulation can be used to show the eventual real effects of alternative conditions and courses of action. Simulation is also used when the real system cannot be engaged, because it may not be accessible, or it may be dangerous or unacceptable to engage, or it is being designed but not yet built, or it may simply not exist.Key issues in modeling and simulation include the acquisition of valid sources of information about the relevant selection of key characteristics and behaviors used to build the model, the use of simplifying approximations and assumptions within the model, and fidelity and validity of the simulation outcomes. Procedures and protocols for model verification and validation are an ongoing field of academic study, refinement, research and development in simulations technology or practice, particularly in the work of computer simulation.

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  1. F

    What's the best shape function/element in finite element methods for phase field simulation?

    What's the best shape function/element in finite element methods for phase field simulation?
  2. megapiano

    Need help with N-body simulation

    Many years ago, for my high school senior project, I wrote a solver for the N-body problem that is performance-optimized using the Barnes-Hut algorithm. (the optimization algorithm is not relevant to my question.) In one particular simulation, I simulated a spiral galaxy. The simulation is not...
  3. Mathhhew

    Common mode current simulation

    Hello! I'm trying to model common mode current with LTSpice, but there is a problem with my simulation. Someone else tried on an other software and got the expected result, but I can't explain why. When going through the capacitor, square signals should become pulses, but that's not the case...
  4. L

    MHB Probability game - Simulation

    Two numbers are bring chosen by random from the set {1,2,3,4,5}. If the sum of the two numbers is even, you win 100 dollars, otherwise you win nothing. In order to participate in the game, you pay $80. What is the expected value and variance of the profit after 17 games ? I solved this one...
  5. Dudiek12

    Simulation of impact on go-kart chasis

    Hello, so recently I have been doing one preetty simple project in FEA, my task was to do a front impact analysis on go-kart chasis. While the simulation itself isn't hard at all and to be honest I had easy job thanks to various sources of tutorials around the web, I feel like I don't understand...
  6. sophiecentaur

    Free simulation software for antenna and feed modelling

    I want to be able to predict the performance of modest (Amateur) Radio Telescope Equipment. Most of what I can find from a basic search will cost a lot of money. (Not surprisingly). I located a free, student, version of CST Suite from Dassault and it appears to be very powerful and can deal...
  7. S

    I Physical proof of a simulation?

    The above article gives lots of evidence to support the claim we are living in a simulation. I know this is usually considered hypothetical, but in the article they give physical explanations that fit topics discussed in this forum. Please read and give your opinion
  8. N

    Optical vs Static Dielectric Constant for E-field Simulation

    I am just learning about e-field simulations and I came across two different types of dielectric constants: optical and static. I'm unsure which to use and in which cases. I would like to simulate e-field intensity to help ensure I'm always below the dielectrics breakdown strength.
  9. U

    COMSOL: stress on a sensor, how to use infinite element domain?

    At the risk of waiting hours on simulations of a sensor, I was wondering if I could use infinite element domain on COMSOL to simplify it. The first image consists of what I would like to simulate but found out that the simulation time is a huge factor as I have a lot to simulations to conduct...
  10. AJSayad

    Grad School Flow Simulation PC Build

    Hey everyone, I'm coming to the end of my Mechanical Engineering B.S. degree and I've been in the process of applying to mechanical and aerospace PhD programs. I want to do research in fluid mechanics; I have some expereience in hypersonics from a Research Expereince for Undergraduates NSF...
  11. song youngill

    Engineering How can I find DC gain via AC simulation in LTspice

    I use this netlist and simulation result came out as shown. I need to find the dc gain here and circuit diagram, but I'm not sure how. I would be very grateful if you could give me the answer.
  12. piyushverma

    Ansys Maxwell: Transient generator simulation torque fluctuation

    I am working on an axial flux generator design, I consisits of 2 rotors and one stator, there are 6 pole pairs and 9 coils. Here is my simulation setup The three phase windings are connected in star configuration through Maxwell circuit. I created two bands enclosing each rotor and then united...
  13. I

    Need a force-like unit for classical particle system simulation

    I am doing a learning project by writing a simulation that includes capacitance and current flow amongst capacitors that may potentially be in parallel. I don't care about certain details yet - dissipation factor, frequency dependent effects, temperature. Tiny capacitences within diode junctions...
  14. T

    Simulation vs Reality: Wind Power System

    Here is a paper on a wind power system and the paper is based on simulation. i just want to know if something in real is built based on the simulation, how close that will be in reality in comparison to the simulation results. And anybody here has experience in building things based on...
  15. D

    I Simulation debugging for Apollo Lunar Landing

    My simulator is trying to mimick the actual conditions of the Apollo landing. I have entered in numbers for my runge kutta simulator for LEM mass, dry mass, fuel, thrust of the rockets, fuel burn rate per second etc etc. But I am not able to land, only very close to landing. I copied the...
  16. O

    Simulation Code for Earth's Historical Temperature Record

    I am new to the field of climate change. Are there publicly available simulation code for Earth's temperature history, going back, say 2000 years, with a resolution on the order of years? Thank you very much.
  17. Y_G

    Optimetrics simulation of a coil and moving permanent magnet in Ansys Maxwell

    I'm trying to simulate a Magnetostatic problem. In my model there are two coils and a reciprocating permanent magnet. I defined a parameter, Xpm (movement of permanent magnet) in x direction to imply the reciprocating movement of permanent magnet like a piston. Xpm = f(t). I defined "t" as sweep...
  18. G

    I Centrifugal Effects During Rail Launch

    I’m writing a 3DOF sim for a rocket. I’m having a hard time visualizing centrifugal effects from the Earth's rotation on the rocket while it is moving along the rail (acceleration > 0). I know that once it has left the rail I no longer need to account for it since it’s in the ECI frame and...
  19. S

    COMSOL - Preventing a moving mesh from stretching in COMSOL simulation

    Hello, I followed the following example for modeling the induced current from a moving magnet in a coil https://www.comsol.com/support/learning-center/article/Modeling-Induced-Currents-from-Moving-a-Magnet-Through-a-Coil-9871/112 If I have a bigger model with a bigger displacement of the...
  20. Melon

    Maxwell 3D & Icepak thermal simulation for a air coil

    Hi Guys, I am doing a Maxwell 3D&Icepak thermal simulation for a air coil. I want to get its temperature when loading 1.6A current. So I use Eddy Current type in Maxwell 3D and Temperature and Flow type in Icepak. Then I load 1.6A solid current and adaptive frequency of 800 MHz for the coil...
  21. Erik Ayer

    I Software for optical simulation with interference

    I would like to simulate both double-slit and Mach-Zehnder interference, with some other common optical components such as lenses, beam splitters, mirrors, and wave plates. Is there something online for this or a program that can be downloaded and run on either Linux or Windows? Thanks, Erik
  22. S

    Steady State Thermal Analysis - Simulation

    I am simulating a hot forging process in LS-Dyna. A tool is contacting a hot workpiece for 2 sec every 10 sec (--0 sec--contact--2 sec--no contact---10 sec--) in a factory. Since this is a continuous process, the tool should, at some point, attain steady temperature. I have tried to recreate it...
  23. Melon

    Icepak coil-plate tutorial simulation problem

    Hi Guys, I am doing a Maxwell&Icepak simulation according to the Icepak tutorial. But I get different result with the tutorial (seems as upside-down). Could you help raise some advice for this situation? Thanks!
  24. K

    A Thermal shock wave question from my hydrodynamics simulation

    This is a fluid dynamic simulation. The top area has 100 degrees Celsius. The bottom area has 0 degrees Celsius. And both are filled with an ideal gas which is 1-atmosphere pressure. Two areas are connected through the left small line. Another part is blocked. So heat transfer can only happen...
  25. Ferdel

    Max Height and Distance of Projectile: Theory & Simulation

    How can i find the angle that a projectile is fired where the maximun height is the same as the traveling distance? I need to find this first in a theoretical way, then i need to confirm this with a simulation. And i need to use only this y=yo+Voyt+1/2gt^2 x=Voxt
  26. Ranku

    I N-body simulation of high or low-mass dark matter particles

    Do we notice any significant difference in distribution and dynamics of dark matter in galaxies when n-body simulations are done with high or low-mass dark matter particles?
  27. K

    RF Energy Harvesting Simulation

    I want to do RF energy harvesting simulation for the measurement of Power Conversion Efficiency. So how can be simulation done on a single platform?. Kindly suggest
  28. Wrichik Basu

    What's wrong in my LTspice simulation of an Op-Amp integrator circuit?

    I am doing an online course on op-amps. The specific video I am talking about is this one (skip to 24:25). Here, the professor has derived the expression of the op-amp integrator circuit, and in the next slide, he tells that we can create a triangular wave from a square wave using this...
  29. bob012345

    Understanding an Inverter Simulation

    As a step to a solar powered battery backup system I wish to get a better grasp on how DC to AC inverters work. This circuit shown below is a 12V DC to 120V AC inverter. I am doing ltspice simulations first and I am working from a circuit diagram included below I found online here...
  30. J

    I Simulation of non-Hermitian quantum mechanics

    I noticed the research on NHQM in the following news release. New physics rules tested on quantum computer Published: 19.2.2021 Information for relevant paper is provided as follows. Quantum simulation of parity–time symmetry breaking with a superconducting quantum processor Shruti Dogra...
  31. A2148

    Automotive Need assistance in Abaqus simulation

    I'm doing static analysis. I have already set up all the prerequisites, preprocessors such as material addition, sectioning, defining boundary conditions, and displacement. However, I'm not getting the results. Please suggest anything. Kindly find the attachment. regards
  32. S

    A All-atom simulation and coarse-grained simulations

    I am currently reading this [paper by Noid et. al.](https://doi.org/10.1063/1.2938860) on the rigorous bridge between atomistic and coarse-grained simulations. In the paper, he defined a linear map from the atomistic coordinates and momenta $$\mathbf{r}^n, \mathbf{p}^n$$ to the coarse-grained...
  33. SalahAhmed03

    Sٍٍhort circuit simulation using ANSYS Maxwell

    How to make a short circuit in stator winding of electrical machine using ANSYS Maxwell? Any information will be highly appreciated.
  34. L

    I 1D wavepacket scattering simulation, momentum distribution formula

    Hello everybody at the forum I'm from Ukraine, I have Chemistry degree, and last year I began to self studying Quantum Mechanics. I'm reading this article: R. Garcia, A. Zozulya, and J. Stickney, “MATLAB codes for teaching quantum physics: Part 1,” [Online]. Available...
  35. JamieSalaor

    I The Simulation Theory and the dangers of pop-science

    . I should preface by saying I'm a geologist not a physicist... Gotta say I usually avoid people who talk about the simulation stuff but I just saw a Tedx by George Smoot and it wound me up... Anyway, the simulation hypothesis seems to me, and most other scientists to basically be a bit of a...
  36. G

    FEA Torque Sim: Custom Wrench Design & SolidWorks File

    I'm making a custom wrench for personal use. For fun, I'd like to run an FEA and see if the wrench will fail. Below is a similar wrench. 100ft-lbs are applied with a torque wrench to the square socket. Where do I fix and apply the load? Should it be a torque or a force? I'm doing the FEA in...
  37. person123

    MATLAB More Efficient Way of Computing Neighbors in Range

    Hi. I have a collection of points in 3D space. I'm using MATLAB to find all pairs of points within a certain range from one another. Right now I'm using rangesearch(X,X,r), where X is the collection of points and r is the range. These points are the locations of atoms and I am attempting to...
  38. U

    Looking for physics based simulation for data generation

    Good day, I am working on physics based neural networks and I am investigating the role of integrating physics based loss function on the network's training. So I am looking for physics based simulation for data generation (online tools) to generate data from experiments. I know I may...
  39. R

    Unreasonable values for engine torque in vehicle simulation

    I'm trying to simulate the physics of a Toyota Camry during acceleration with a time granularity of 100ms. My simulated conditions are as follows: m = 1590 kg v = 17 m/s a = 1.5 m/s2 η (transmission efficiency) = 0.85 rwheel = 0.35 m Fdrag = 100 N Ffriction = 260 N Faccel = 1590 kg × 1.5 m/s2 =...
  40. dasil12a

    3D Solid State Simulation Software

    How did you find PF?: Google I am studying the mechanical/electrical nature that govern certain nano-fabricated crystalline structures. Can someone with experience please recommend a 3d Solid State Simulation software that will allow me perform the following: Allows individual 3D placement...
  41. R

    Do we live in a simulation, Scientific American article posted today

    https://www.scientificamerican.com/article/do-we-live-in-a-simulation-chances-are-about-50-50/ I mentioned this just last night and a great article in Sci American was posted this morning. So what do you think, are we living in the matrix? I say no, however I have no problem viewing DNA as a...
  42. H

    Ansys Maxwell Simulation- Torque Fluctuating

    Hi guys! I do have a problem in ansys maxwell simulation of a generator. The moving torque (which represents electromagnetic torque) fluctuates around zero which is not correct. Induced Voltages are ok. How can I fix this problem?
  43. S

    Halbach-Array Simulation FEMM

    Hello everone, I have recently come across the need of a strong constant magnetic field while being limited in space. The field needs to be unidirectional and up until now was generated by two magnets (12x12x12mm N48). Then I came across Halbach arrays and their potentially stronger magnetic...
  44. J

    Best Environment/Programming Language for simple physics Simulations

    Hello, I am looking for something to simulate/visualize simple particles and classical physics equations, preferably moving in real time Requirements: -Able to turn matrices/functions into geometric representations(visualize sphere, visualize a cylinder etc.) -Can do the classic ball bouncing...
  45. Arman777

    A N-body simulation with varying neutrino mass

    I am trying to find a picture of the N-body simulations that shows the LSS. Particularly I am looking for different neutrino masses without the CDM. For instance pictures likes this But with more varying/different neutrino masses. I am looking for articles
  46. ShadownightPrograms

    I Many-Worlds Theory: Simulation Program in C#

    Here is the Code File in an txt. I can on request provied the whole Program, which includes the PSE, AtomFunctions and many useful but not all implemented Funtions to solve the Many Worlds Problem in C#. Please feel free to ask questions via here or email [e-mail address deleted by Mentors] I...
  47. J

    B Accelerate Light-Clock Simulation: Proper Time & Coordinate Time

    So this what I found out: One cycle takes less coordinate time, and less proper time according to the lower mirror when the clock accelerates. Proper time per one cycle does not seem to get larger with more cycles, although coordinate time per one cycle does get larger. So what do you think...
  48. Ericdjs

    Could anyone help me with my problem, my MCNPX simulation is not working

    My MCNPX is not working when I start the calculation. It says "bad trouble in imcn in routine xin cross-section file bertin does not exist."
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