What is Simulation: Definition and 848 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. S

    Engineering Solve Inaccurate CFD Predictions: Improve Results

    Hi Im confused with what the CFD Results show or mean. I have never done CFD before and don’t have any material explaining it. Question Find areas of potential inaccurate predictions in the simulation and improvments. This is the instructions I had to follow...
  2. Engineer_Kosyakova

    COMSOL: Simulation of liquid nitrogen cooling (Help please)

    The InSb sample (parameters 10x10x0.5 mm) is glued with silver glue to a cooled copper table. Liquid nitrogen passes through the table. While the model is at a temperature of 300 K and at a normal pressure of 1 bar. The sample is affected by a beam of electrons, which causes the surface to heat...
  3. E

    I Research paper and sources investigating Earth's moons

    Hi. I am looking for scientific papers, articles and/or even simulations that investigate how many moons it would be possible for earth to have and maybe modern theories about what these moons can be and look like (i.e what characteristics they have) if they were to exist. I have googled and...
  4. Astronuc

    Modeling and Simulation in Nuclear Energy

    Modeling and simulation, or computational physics/chemistry, is a large and important part of engineering. In nuclear energy, there are applications of finite element methods (and occasionally finite different or finite volume depending on the problem) applied to nuclear plants, nuclear...
  5. physicsclaus

    Sending drive Pulse in CQED and visualize the state by QuTip

    [Mentor Note -- This thread is a continuation of a previous thread, with the emphasis in this new thread on the programming implementation. Previous thread is here: https://www.physicsforums.com/threads/can-anyone-give-me-the-details-of-creating-a-cat-state-in-circuit-qed.1048821/ ] Hello...
  6. Jessie24789

    I Possible issues with Doppler shift and Christoffel symbols

    About a month or two ago I started doing simulations of light physics around black holes and yesterday I got a fast Christoffel symbols function for the Schwarzschild metric in cartesian coordinates, but now the photon ring appears flipped. I feel as though it is wrong. But as I am still pretty...
  7. R

    I I made an N-body simulation program

    My little project - 3body simulator started as a programming exercise, which I attempted to make a program that solves the famous 3-body gravity problem using numerical integration. Later I gained interest in the underlying physics and expanded the program to solve N-body problems involving...
  8. FEAnalyst

    Triangular cavity thermal radiation simulation

    Hi, I'm trying to solve a problem involving radiation in a triangular cavity: As you can see, lengths and emissivities of all surfaces are given. For two of them, the heat flux is known and the temperature has to be found while for the remaining surface it's the other way around. I have the...
  9. S

    Automotive Amplitude based frequency response simulation in Abaqus

    Hi, I have inputs like displacement of a driving mechanism and then the frequency of concern . Displacement: 0.2 mm Concerned Frequency: 100 Hz I would like to evaluate a part with the input displacement applied to a node and not as base excitation. It can be sweep over the frequency range...
  10. shivajikobardan

    MHB What is the difference between activity and event in "simulation"?

    I am studying about components of a system. Activity-: It is What entities do to cause changes is activity. It is represented by time period of a specified length. Event-: Event is defined as an instantaneous occurrence that might change state of the system. Endogenous events occurs within...
  11. TheJP78

    Building a Solar System simulation with python

    Hey'all. First of all, I'm not fluent in English, so forgive me for the spelling mistakes. So, I'm trying to make a simulation of a solar system using python 3.9. It's not complicated, but my teacher wants me to do it using the Basic Verlet method, and that's what is bugging me. He told me do do...
  12. T

    I Interesting Simulation Result

    Hey All, The simulation I am currently looking at is regarding the following paper: https://iopscience.iop.org/article/10.1088/1367-2630/10/4/045030. Let us define J = C_{3}/R^{3} (equation (2) in the paper) and let T be the simulation time until the trajectories of each particle changes by at...
  13. tysonman166

    MCNP6 simulation still running but no change for a while

    After previous thread my program finally work and i could get the Keff final. But problem rises when MCNP want to do "predictor" and "corrector". I already wait for 3 hours but there is no update for the corrector (screenshot attached). heres the profof that my program still running: and in...
  14. Hasan2022

    COMSOL simulation of a 3D Ferrite Bar Numerical Model For Magnetic Flux

    Hi, I am willing to simulate a 3D ferrite bar transmitter and reciever where coupling coefficient k and Bt magnetic flux density on the each side uses the finite element method for solving partial differential equations. The Magnetic Fields module has equation (jωσ − ω2ε0εr)A + ∇ × H = Je...
  15. P

    I Relative Strength of the Magnus effect relative to gravity

    I have made a simulation of a table tennis ball being hit and landing on the table. There are 5 differential equations that are integrated to compute the horizontal position, horizontal velocity, vertical position, vertical speed and spin. by integrating 5 differential equations simultaneously...
  16. ThiagoMNobrega

    I Blender Particle Photon Simulation (interesting results w soft bodies)

    (0:00 / 0:42) photon going light-speed blender simulation I have no idea how a mathematician would translate this example into an equation. Every time I've worked with soft bodies I seem to run short of mathematicians buddies. Regardless of the mathematics of continuous object deformation, this...
  17. bob012345

    Simulation of two Small Interacting Antennas

    I would like to simulate two small interacting antenna's with fields and forces in 3D. They can be simple wire antenna. I am asking if there is a recommendation for software that can reasonably accurately handle that which is free? Thanks.
  18. user366312

    A What is meant by pruning and enrichment?

    As far as I understand: Pruning means deleting something. Enrich means to enhance/increase weight. Now my question is, in the case of the PERM algorithm, Are we deleting some polymers chains? Or, are we deleting some beads in all polymer chains? Are we increasing the weights of some...
  19. user366312

    Polymer simulation source code in C++ and Python

    I am absolutely new to Polymer simulation. I am trying to understand the simulation by analyzing source code written by others. Can anyone tell me what are the differences between the following three source code in terms of their objectives? Monte-Carlo-simulation-of-polymers...
  20. person123

    I Shallow Water Wave Equation Simulation: Reverse Shoaling?

    I'm creating a simulation of the shallow water wave equation in MATLAB. I'm using the equations: $$\frac{\partial v}{\partial t}=-g\frac{\partial \eta}{\partial x}$$ $$\frac{\partial h}{\partial t}=-h\frac{\partial v}{\partial x}$$ Iteratively updating the velocity from neighboring heights...
  21. 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?
  22. 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...
  23. 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...
  24. 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...
  25. 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...
  26. 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...
  27. 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
  28. 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.
  29. 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...
  30. 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...
  31. 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.
  32. 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...
  33. 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...
  34. T

    Simulation vs reality

    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...
  35. 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...
  36. 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.
  37. 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...
  38. 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...
  39. 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...
  40. 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...
  41. 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
  42. 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...
  43. 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!
  44. 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...
  45. 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
  46. 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?
  47. 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
  48. 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...
  49. 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...