1. ### 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...
2. ### 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...
3. ### 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...
4. ### Comp Sci Galaxy simulation with the velocity Verlet algorithm

To simulate the trayectories of solar systems around a blackhole (i.e. a galaxy) I have 3 classes in C++: cSystem, cBlackHole and cGalaxy. cSystem assigns initial values of position, velocity, etc to a solar system. cBlackHole does the same but just for the black hole. And cGalaxy mixes...
5. ### Virtual Physics Labs - giving some resources and asking for some

Hi all! Like everyone else, our university physics department is prepping for online labs. We are utilizing great simulations from several sites, check them out below if you haven't already. We are able to rewrite many of our labs 1:1 conversion to online! Colorado PhETs...of course ...
6. ### How can I create an equation in matlab for image processing?

Here is the documentation for the 2DFFT: https://www.mathworks.com/help/matlab/ref/fft2.html how would I go about creating this formula on matlab to apply it on an image? My guess is that I need to create the equation and then multiply it to the image I need such as: $$U = VI$$ where V is my...
7. ### Line filter, proper LTspice simulation

Dear forumers, I have two high performance AC feedthrough capacitors (47nF, 100A, class Y2, DC-60Hz) which I want to either combine with a general purpose EMC line filter, or build a custom one to filter the mains from of about 100khz to as high as possible (for shielding purposes). I can see...
8. ### A Thermodynamics: calculate thermodynamic derivative from data?

I don't understand how to use output from an NPT molecular dynamics simulation to compute a thermodynamic derivative. I need to compute this (where "d" is a partial derivative, "T" is a subscript that means, "at constant temperature," and "E" is internal energy): -(dE/dV)T I have a simulation...
9. ### Modeling/Analysis of optical fibers

Hello PF, I need some guide points to help me formulate a project idea on the topic of optical fibers. Namely, the professor suggested I should look for topics on modeling of optical fibers, analysis of different optical fibers, characteristics etc. and to work in a simulator, or perform a...
10. ### How can I make a simple inductive MHD thruster in water simulation?

Homework Statement:: Simualte the behaviour of water around an mhd inductive thruster Relevant Equations:: https://www.comsol.fr/paper/download/45837/Pintus.pdf Where can I start this simulation ? What is the required software ? [Mentor Note -- thread moved from the technical forums]
11. ### A Velocity change under drag and other forces: small mass, large delta-t

I am working on simulating the movement of small spherical objects under the influence of drag and a number of other forces that, at least for now, don't depend on the object's velocity. Normally I would sum up all these forces, including drag, to ##F_\Sigma## and update the object's speed...
12. ### The simulation of a microwave antenna made of nanofilm Ti3C2 (Mxene)

Hello! I am a student of the radio engineering faculty and now I am engaged in master's work. The purpose of my work is to find application for Ti3C2 in antenna technology. I found a lot of information from article http://advances.sciencemag.org/content/4/9/eaau0920 But I can't understand how...
13. ### Free circuit simulation software/website for beginners

I was looking for simulation softwares that are free. I looked at some on the net, but they aren't satisfying my basic requirements. A simulation software should at least have the following for my use: Arduino support Support for buck converter Solid state relay Transformer Variable AC supply...
14. ### A (a,n) Reaction Simulation

Hi, Can someone suggest me an open source code for simulation of (a,n) reactions? I want to build a geometry(sphere) with an a-decay radioisotope covered by Beryllium and count the neutron production. Thanks a lot
15. ### A Dissociative ionization Monte Carlo simulations

Hi, i'm wondering if there any exists a Monte Carlo free code that can simulate dissociative ionization, per example a beam of protons on water, and then track the fragments (from water) and their energy. Thanks in advance!
16. ### A What is best way to start learning DMRG for Fermions?

I want to learn the density matrix renormalization group (DMRG) method in traditional formalism (not MPS). While there are many good introductory level articles available for bosonic (and spin) systems, I have not encountered any introductory level article which deals with fermionic systems i.e...
17. ### A How to numerically diagonalize a Hamiltonian in a subspace?

I want to exactly diagonalize the following Hamiltonian for ##10## number of sites and ##5## number of spinless fermions $$H = -t\sum_i^{L-1} \big[c_i^\dagger c_{i+1} - c_i c_{i+1}^\dagger\big] + V\sum_i^{L-1} n_i n_{i+1}$$ here ##L## is total number of sites, creation (##c^\dagger##) and...
18. ### Using a normal processors for HPC

Hello all: Can you use current of shelf multicore PC as a high performance computer Can it handle the job ? Dose the outcome data tables and simulation results , is correct and with low error margins With out gpu like cuda or opencl Best Hagop
19. ### A Lagrangian vs pseudo-Lagrangian vs Eulerian

I'm reading up a series of papers on hydrodynamical simulations for galaxies and cosmology. They keep mentioning things like "Lagrangian" or "pseudo-lagrangian" or "Eulerian". I tried looking it up on the internet, but the answers are either too broad and could mean a huge number of things in...
20. ### Defining a BH loop in Ansys Maxwell?

Does anyone have an idea how to insert a BH loop like the one I have attached in Ansys Maxwell and not get an error like in the other picture which is also attached? I have seen it multiple times in different texts but can't define one myself without getting this annoying error. Also the...
21. ### A LQG Simulation

Hello, I am contacting you because I would like to know if there is a way to simulate quantum loop theory. Indeed, the S-Knots are much more complex objects than graphs because between the points there is a curve that can be knotted. S-Knots are graph embeddings in 3D and I do not see how such...
22. ### How to define a hysteresis loop in ANSYS MAXWELL?

I am trying to simulate an electric motor in ansys maxwell software, but I can't define the whole loop in four quadrants for the material used in the rotor however it is essential to do this since the motor is of hysteresis type and works on the principle of working point moving all around the...
23. ### I Planetary accretion model?

Hi - having come up blank when searching, I figured I'd ask here: do you know of any (free, preferably open source) planetary accretion models/simulators available for download? I'm primarily looking for solar system formation / evolution rather than planetary geochemistry (although I'd have an...
24. ### MATLAB Switched from win10 and MATLAB to ubuntu and python"q"

Hi, I felt like I have to learn more than one coding language, and wanted to strengthen my coding skills in general. I am good with Relap5 but I want to learn OpenFoam. is what I did logical and going to be worth the pain ? also I only have the Relap5 version of a windows ,is it possible to run...
25. ### A Simulation from a process given by "complicated" SDE

Actually this is more of a simulation question but since PF doesn't have Simulation category I ask here. I need to simulate a path from a proces given by this Stochastic DE: $$dX_t = -a(X_t-1)dt+b\sqrt{X_t}dB_t$$ where ##B_t## is wiener process/brownian motion and a and b are just some...
26. ### MCNP source definition question

I'm modelling a scenario for the research that I'm working on, and I got the cells and surfaces all mapped out for the environment finally, but now I'm totally stuck on creating a source. I'd like a point source of Californium-252, but after hours of looking, I don't see any out of the 1000...
27. ### Simulating a Faraday Cage

Hi guys, I'm wanting to simulate faraday cage form, analysing mesh perforations defined by wavelengths of different electromagnetic spectra (eg. radio, microwave, UV etc). Are there any good analysis softwares which I could import a pre-made digital model with these perforations and simulate...
28. ### News Universe is a Simulation

Now, we all know all physical things are related to math. EVERYTHING is related to math. Now, we have all heard the theory that we are all living in a simulation, right? What if... math is the coding of the simulation and throughout time we have been decoding our own simulation.
29. ### Recommended physics engine?

Hello! I'm trying to write a 2D program that uses simple physics. I was wondering what would be the best 2D physics engine to use in my case, and if it even matter what engine I choose. I also want my simulation to run in real time, so at least 30 fps on a decent home computer. I prefer a fast...
30. ### Need tutorial for magneto static simulation of C-core (Imag)

Hello all, I am a new member of this forum, I would like to know where can i find the detailed tutorial of magneto static simulation of C-core. I am in the middle of one project and for further move I need the magneto static simulation of C-core. The image is attached.