What is Simulations: Definition and 116 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. E

    Mathematica Numerical vs. Monte-Carlo Simulations

    I have an integration that doesn't have a solution in the table of integrals. So, I evaluated it using Mathematica using the command NIntegrate. However, when I compare the result with Monte-Carlo simulations, there is a very small constant gap between the two curves. Is it because of the...
  2. F

    A A question about how to start ab initio simulations

    I want to simulate STM images of some compound composed of 3 molecules A, B and C.. Which is the right way to do the simulations? *Use the known equilibrium geometries of A, B and C as input for simulating the compound? or *First optimize the geometries of A, B and C independently and then use...
  3. F

    Understanding The Meaning and Use of Phase Space

    Hi, I am trying to fully understand the meaning and usage of phase space in the various contexts it's used. For example particle physics, classical mechanics, statistical mechanics, thermodynamics, relativity. Also, there is configuration space, parameter space, and state space. How are all of...
  4. A

    Computer Building a rig for simulations

    Hello! As the title states, I want to get myself a new rig for simulating complex physical phenomena. Specifically, I'm going to run quantum chemistry/solid state physics/atomic physics calculations on it. I'm planning to re-use some parts of my old PC, and buy some new ones. I want to spend...
  5. tesla_sm

    How do we model metal nanoparticles for MD simulations?

    I am trying to model metal NPs capped with organic agents to simulate their phase transfer behavior from aqueous to organic. Not doing computational chemistry courses has had me to disadvantage. Would love some initiation or a jump start primer for the same. Looking forward for cues to get me...
  6. A

    Quantum Mechanics Simulations - Project

    Hello. I am not too sure if this thread is the right place to post this in. But anyway. I have to make a project for my final year, and I have chosen to make a quantum mechanics based project. I am thinking of doing some quantum mechanics based simulations, give a little bit of history of...
  7. wolram

    How have N Body simulations solved the missing satellite problem in ΛCDM?

    http://arxiv.org/pdf/1511.01098.pdf We conclude that the “problems” often cited as challenges to ΛCDM are resolved in simulations that reproduce the dynamical constraints of the Local Group environment and include a realistic galaxy formation model. Reionisation and supernova feedback allow...
  8. B

    Optical simulations of gravitational effects

    I'm preparing a poster presentation on the following paper for a physics course: http://t.co/xiCLV7Y0ZH I do not understand how figure 4 tells us about the red/blue shift. Just from the deflections of the peaks of the airy beam, as well as the deformation, how are we able to infer that there is...
  9. D

    LPF gives 2 different simulations

    I've designed a 3rd order BPF. I tuned it in AWR Design Environment (Microwave Office), and got the response I wanted: However using the same component values with LT Spice gives me a different response: The other thing I've noted in the plot is the input voltage. I'm not that familiar with...
  10. O

    Dark matter particle search at CERN vs cosmology simulations

    Dark matter particle candidates are being searched at CERN and the various dark matter models are being probed by cosmological simulations. The usual way to probe models via cosmology is to plug a candidate into a cosmological simulation and then compare the results with observations. Yet...
  11. T

    First cosmology computer simulations

    I understand that the first cosmological computer simulations Did not have DM Only gas dynamics on expanding grids And, that those sims produced no structure of any kind No LSS Only vast expanses of nearly uniform space plasma Devoid of any clumps Essentially reminiscent of the real...
  12. S

    Pairwise velocity dispersion in Cosmological simulations

    There are numerous publications about pairwise velocity dispersion ( PVD ) of galaxies in real redshift surveys. It is customary to use an exponential form for the distribution of pairwise velocities and then model the redshift space distortions in the 2PCF to retrieve the PVD. Now if i have a...
  13. G

    Time Lapse Simulations: Traveling Through Space at Light Speed

    In the Hubble Ultra Deep Field photograph, they show a 3D simulation of traveling through it. (Cue to about 2:00 minutes.) Obviously the simulation is traveling through that field faster than the speed of light. What would that field actually look like while traveling near the speed of light...
  14. M

    Can anybody help with group velocity simulations?

    On first reading, the description of ‘group velocity [vg]’ appears to be quite straightforward. However, I also found a number of speculative explanations as to ‘how’ and ‘why’ the group velocity may exceed the ‘phase velocity [vp]’. Therefore, in order to get a better intuitive understanding of...
  15. allamsetty

    Multi Scale simulations on windows 7 32 bit Computer

    I am Post Graduate in Physics and working as a researcher in Non Destructive testing. I have heard about multi-scale simulations and its applications to material modelling. Iam intersted in learning mutiscale simulations for materials modelling. can anyone provide me links that would let me...
  16. S

    Light-cone cosmological simulations

    Hello, I would like to understand in detail what are the Light-Cone cosmological simulations and the difference between N-body cosmological simulations. If anyone is familiar with the topic i am open to an explanation or perhaps he could recommend me a review or an article about the...
  17. G

    Resources for simulations in physics

    Hi, Could you please recommend web resources with similar simulations as here: http://phet.colorado.edu/en/simulations/category/new thanks
  18. denjay

    What is the value of simulations in science and engineering?

    I'm looking at some Materials Science graduate programs and some of the research areas involve simulation of material growth and properties. I'm kind of wondering what the value of this kind of research is as opposed to more practical research. This probably goes into the philosophy of science...
  19. R

    Computer Simulations and Their Importance

    Can a computer simulation lead to a scientific discovery from an epistemic point of view? Do you know any of such discoveries throughout the history of physics?
  20. L

    Critical exponents in Monte Carlo simulations

    In Monte Carlo simulation of classical spin systems I have a trouble to determine critical exponent ##\alpha##. ##M \propto L^{-\frac{\beta}{\nu}} ## ## \chi \propto L^{\frac{\gamma}{\nu}} ## ## C_V \propto L^{\frac{\alpha}{\nu}} ## Is this correct? From that slope of the curve ##\ln Cv## as a...
  21. C

    Career in Simulations: Pursuing Job in Fluid/Chemical Simulation

    I've gotten really interested in CFD and DFT recently. I have a BS in Chemical Engineering and will be 25 in about a month. Been working in the oil industry for the last 2 years and before that I worked in a carbon nanotube and graphene 'factory' for lack of a better term that I can come up with...
  22. M

    N-Body Simulations: Exploring Matter and Dark Matter

    Hi. I read due interest papers in Arxiv. There is many times refereed to so called N-Body Simulations. Is that for Matter or Dark Matter? How does it work, can someone explain or suggest good readings? THX
  23. J

    Initial Conditions of Astrophysical Simulations in 3D

    So I've been playing with a little N-body code in 3D for gravitational problems and have made an OpenGL visualization to go along with it. I have been generating initial conditions (positions and velocities) using explicit formulas. I was wondering of anyone knew of any resources for getting...
  24. N

    Molecular Modeling and Simulations

    Hi all, I am currently a junior in chemical engineering and want to go to graduate school for it. I am extremely interested in the materials side of renewable energy. To make a long story short, I don't enjoy being in the lab much but really do enjoy thinking about it, researching, and...
  25. Biosyn

    Simulations / Computer programs

    Hello, Would someone please give me a list of free programs that I can use to simulate probability experiments/distributions. Such as drawing 5 cards randomly from a deck or rolling 5 sets of 20 sided dice. Or do I have to learn R or something?
  26. M

    MATLAB Getting Started with MATLAB Simulations of Basic Equations

    Hello friends, I am new to MATLAB and I have been asigned a task in MATLAB to simulate basic equation.. I have no idea how to start.. The equation is Arterial pressure= Mean arterial pressure - h*7.46 (h= height) Can you tell me how to do please? thankx
  27. D

    Molecular Dynamics simulations of Silicon-Energy Problems

    Hello everyone! I have constructed a model of a silicon crystal, consisting of 64 atoms, for my various needs of testing physical phenomena in that substance(Silicon). At present, rather annoyingly, I am still stuck at the basic operational level, that is, calibrating the system to an expected...
  28. K

    Free Energy calculation in Monte Carlo simulations

    Hello everyone, I am currently working on a classical MC simulation of helimagnets and I try to calculate the experimentally measured phase diagram. Up to now I am able to reproduce a large piece of the phase diagram by using a single site Metropolis update and simulated annealing...
  29. fluidistic

    Water models, numerical simulations questions

    From http://www.lsbu.ac.uk/water/models.html, I see that are many models of water that can "explain" one or some properties of water but no model is accurate enough to explain all the properties of water. From what I understand, all models assume classical mechanics interactions...
  30. E

    Quantum physics computer program simulations

    Does anyone know of any computer programs that can be used for quantum mechanics applications?
  31. D

    Molecular Dynamics simulations Surface interaction energy

    Hey, I've simulated a solid metal cluster of gold fcc100 And a surface Platinum in fcc111 using a classical mechanical approach. Do you think i could get the surface free energies(the ones to use in determining the Wulff shape) from periodic boundary conditions and if so how? I am really...
  32. nearc

    Computer simulations of expanding space

    i'm looking for computer simulations of expanding space. i made a couple of very very very simple models and my results were no where near our current model of space. hence, I'm looking for work that has already been done on the subject.
  33. G

    Good software for programming animated physical simulations?

    I'm looking for what might be best for simulating various physical phenomena - some examples off the top of my head might be how to create an animation of a double-pendulum, or a system of 250 particles that are mutually interacting, confined within some box, in an arbitrary external field (like...
  34. M

    Book about physics simulations and game dev in F#

    Hi! I am Giulia, and I hope the following message is of interest to some given the topic.* I have just co-authored a book: "Friendly F#, fun with game programming and XNA". The book aims at teaching the F# language through a series of samples that are fully centered on physics simulations...
  35. M

    Fully relativistic, cosmological N-body simulations

    Hi, as you all know, current cosmological N-body simulations (like the Millenium run) are based on the Newtonian limit. Gravitational fields are supposed to be rather weak and therefore the force between dark matter particles reduces to Newtonian gravity. Other relativistic effects are...
  36. S

    Simulations - Programming languages?

    I was wondering whether anyone has experience in astronomy simulations. If so, what language do you use and recommend? I've done Haskell and a very small bit of C++... I've been told Python is good, what are your thoughts? Also are there any good websites that may get me started? Thanks
  37. L

    Event driven Verilog simulations

    I know Veriog simulators are event-driven and what matters is the moment that event happens. Suppose we have a code like, module inv (in, out); input in; output out; wire inv_s1; reg out; assign inv_s1 = ~in; assign out = ~inv_s1; endmodule My question is does inv_s1...
  38. A

    Decent electrical circuit simulations

    Hi, I am trying to analyze circuits with a capacitor, diodes (normal and zener) and load resistance. Was wondering if anyone knows of good simulations on the web. Had a search but didn't find anything decent except this www.alternate-energy.net but it doesn't have zener diodes... In the lab we...
  39. K

    Projects on monte carlo simulations

    Hi all... I am just starting off with the monte carlo methods... I have done some work with self avoiding walks and ising models.. Can someone suggest some project that can be taken on as part of a Master's thesis.. thanks..
  40. S

    Intro to Gravitational Simulations

    Hi all, I recently was posting in another thread on how to properly integrate the equations of motion in gravitational simulations. I thought this would be a good opportunity to provide some basic knowledge on simulations, numerical differential equations, and a little bit of programming. I'm...
  41. edpell

    Numerical Simulations of General Relativity: 1000 Blobs

    When can we expect to see numerical simulations of GR for cases that are not highly symmetric? Say 10^3 blobs of matter in an arbitrary initial configuration.
  42. G

    Mathematica Wolfram Mathematica Simulations & Demonstrations

    On web where I can find interesting samples, math, physics or nature simulations like this o: http://demonstrations.wolfram.com/"
  43. DrChinese

    Why the De Raedt Local Realistic Computer Simulations are wrong

    In another thread, we were discussing Zonde's and the De Raedt's model for simulating Bell tests using a purported local realistic computer simulation. I have broken out into this new thread some results which will be interesting to those of you interested in this subject. I will start out by...
  44. W

    Does chaos means long term numerical simulations useless?

    i am now reading a prl paper the authors used numerical simulations to study a nonlinear system in some parameters, the authors state that system enters into chaos My numerical simulations are the same as that of the authors in the regular regime but in the chaos regime, my...
  45. W

    Does chaos means long term numerical simulations useless?

    i am now reading a prl paper the authors used numerical simulations to study a nonlinear system in some parameters, the authors state that system enters into chaos My numerical simulations are the same as that of the authors but in the chaos regime, my simulations are quite different...
  46. CFDFEAGURU

    Explore CFD Simulations with OpenFOAM

    Hello all, OPEN FOAM is an open source program for performing CFD (Computational Fluid Dynamics) simulations. Here is the hompage for it. http://www.opencfd.co.uk/openfoam/ It requires a good deal of source code interaction in order to run. (So I have been told.) That is why I...
  47. J

    Java Circuit Java Simulations - Amazing

    Hi all! This may have been previously posted before but check it out! Just discovered this today. It's really cool. Great for getting an intuitive feel for what is happening in circuits. Try hovering over the components to get simulation info of each component...
  48. P

    NMR Spin-evolution simulations

    Hello, I have been running spin evolutions with 8 spin 1/2 nuclei, but I am having issues increasing the number of spin 1/2 nuclei to 12. I get the following error message in command prompt. Firstly Spinevolution appears to be loading as normal, but then after a minute or so the simulation...
  49. S

    Exploring Hadronic Jets with GEANT4 Simulations

    hi, I am a PhD student and I'm looking for a course or resources on the hadronic jets and the models used to deal with them in the code simulation GEANT4. (Example: Bertini model, cascade ...) I will be very greatfull if you can help me. Thank you in advance Sameh
  50. B

    Theoretical particle physics research - simulations and theory

    I have just embarked upon a PhD in Lattice QCD. I'm wondering, what is research like in other areas of theoretical particle physics? Lattice is highly computational and fairly light on theory so it seems a lot of people in the field spend quite a bit of time making/updating and running large...
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