Simulation Definition and 816 Threads

Hi, what I thought I'd managed to do some months ago was to create a 2D manifold movement simulation / visualisation on a catenoid, to make a traversable [cross section of an] Ellis wormhole. I have noticed, though, that the geodesics on the Wikipedia page for the Ellis wormhole don't really...

Hi everyone, I'm working on a Python simulation that aims to replicate the Apollo 11 translunar injection (TLI) in a 3-dimensional geocentric system. My model includes Earth, the Moon, and a Saturn V–derived Apollo 11 rocket. The simulation starts at the moment of TLI, using initial positions...

[Mentor Note: Two threads on the same project have been merged into one] I need serious help with this. I'm totally stuck as to why my results are mediocre. It would mean a ton if someone could at least point me in the right direction. Below is my attempt: import matplotlib.pyplot as plt...

Dear all, I want to simulate an X-ray tube and check the dose rate in the room. My problem is in the data card. I don't understand how to write sdef, tally, and others. I simulate 85kV with 25 mAs and the source position is at 0 0 0. Regards, anggi

I've been working on a problem for a while now, it's taken me into various directions, but I think I finally figured out the puzzle. But unfortunately I can't take it really any further, cost effectively, without some computer simulations of the experiment. It's all basically physics based. I...

respected all i am using MCNP6 and i am facing this problem from days and i can not found solution if anyone help me than i am ever grateful to you files are attached Thanks

I want to make a 2D game with gas (stardust) simulation. (I'm lazy to learn statistical physics and integrate thing by my self so) I want to know how gas spread, and how gas interact with circle object. There will be 2D square grid. Each cell contains values of the state of the gas (a struct...

I'm working on this Monte Carlo simulation problem for radiation propagation. So far I think I have accomplished creating a histogram of simulated values (iii). Now I need to plot it against the exact PDF. I need to find the normalized PDF, but can't obtain the normalization constant, and so on...

Hi, I am willing to simulate a 3D ferrite bar transmitter and receiver 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...

Hi, I'm trying to simulate how much lead i need to put in front of my source to reduce low energy scatter from reaching my detector. I have 4 cells currently. Cell 1: The source cell, im using a Cs137 source (0.662 MeV). Cell 2: The collimator. I'm simulating a cylinder to be placed in the...

When I increase the number of nodes in the simulation (e.g., -N 3), the number of runtpe files and outputs generated equals the number of nodes; in this case, three runtpe files and three outputs appear. Each output has a different simulation time, and sometimes even different results. Is this...

Dear all, hope you are doing great. I am designing a circuit using EasyEDA simulation tool. But I am facing a problem after connecting the relay to the single-Chip IC (STM32 103RTC6). The low voltage is showing around 2V, whereas it was originally supposed to be 0 volts. I am still unable to...

A hollow cylinder with dimensions 2 m radius,6 m height and weight 200kgs And a massive sphere weight 2000kgs with radius 30cm is placed inside the cylinder and is free to rotate. Now the whole system is tilted to it's critical angle and is rotated around a circular track. The circumference of...

Until recently, I was not seriously interested in physics. But while working on my project called Enland, I became interested in the quantum universe, if I may say so. The Enland project is an attempt to begin simulating the Third Reality. That's what I call the world in which everything is...

I am interested to simulate a problem in mcnp6, in which gamma rays (energy let say 10 Mev) incident on a aluminum disk and produce electron spectrum which further move in a gas (e.g co2)cell to produce chernkove radiation. Here gamma produce electron and electron further produce chernekov, in...

Hello ,I have the following resonator Its very intresting. I need to simulate it .Is there some theory regarding this resonator ? so i could control it and see which modes could be made from it? Thanks.

TL;DR Summary: Sims and sample size A statistics question I have in my notes goes like this: Our significance level ##\alpha = 0.01## The percentage of left-handed people in the general population is ##10\%##. Liliana is curious if this is true for her arts class and so she takes a random...

Hello! I want to simulate (numerically if analytically is not possible) the behavior of a 2 level system, when driven by a laser (basically transition probability vs laser frequency for fixed pulsed time) accounting for the laser and atomic linewidth (in my case I can assume they are...

When I simulate a point isotropic gamma source in mcnp usually number of particle histories to the tally region (let say a detector placed at 30 cm from point source) is much low (few hundreds only) as compared to actually particle histories (1.0E7), Will it be correct if convert isotropic...

Hi everyone. is it possible to simulate low energy photon in wavelength range (300 nm to 1000 nm) in MCNP. If not possible in mcnp please suggest any other code to simulate it. thanks

I am interested to calculate dose rate (gy/h, rad/h) from a point source at a certain distance through MCNP. If I use F6 tally it will give answer in Mev/g which can be converted to Gray or rad by using FM card, but I don't know how can I find dose rate like rad/h or g/h.?

Hello all, I am doing a monte Carlo simulation using Wolff algorithm for the 2D/3D Ising and classical 3D Heisenberg model, I have been told that the rule of thumb is to make your decorrelation steps = 10*L where L is the size of lattice, and this is would be sufficient enough to make...

Hello everyone, I am currently working on a Monte Carlo N-Particle (MCNP) simulation and have encountered several issues that I hope someone here can help me resolve. My project involves simulating a brachytherapy treatment room, and I am struggling with defining the cells, surfaces, and...

Hi everyone, I'm a newbie to MCNP, I'm trying to calculate burnup for this pellet I include here in a PWR in an infinitely repeated geometry, but it seems to be failing for some reason. I get the error message: ctm = 0.00 nrn = 0 dump 1 on file runtpp.h5 nps =...

Hi everyone!:) I'm Having a rough time with Rsoft BeamProp simulation software, I am simulating an multi-core fiber with my own specific design and am trying to divide the fiber into regions (in z axis) - the software would only let me divide a specific core (and more specifically the middle...

does anyone know the derivation of the general solution of the nonhomogeneous equation shown in the image (book name: Devendra K. Chaturvedi - Modeling and Simulation of Systems Using MATLAB and Simulink -CRC Press (2010))

Hi, I have a plot of v(onoise) of my circle using noise simulation. I also have my V(output) from my ac frequency analysis. How do i divide between the graphs?

I'm beginning in Vised for MCNP6 and i want to modify my imput file inside vised to understand how when i changed cards this affects the simulation. The problem is that i can't save inside vised my imput file, i have to open my imput file in an editor text an then reopen this file in vised...

Hello, I am trying to simulate the load-unload test in Abaqus under the following loading schedule using my UMAT (which has already been validated). As you see, the load-unload test is pure tensile with positive displacements; however as I modelled it in Abaqus the force-displacement curve as...

Hi all I am a new user of MCNP.I want to simulate radioactive decay of Bi-213 (whole decay chain till stable element) in two concentric spheres of water (let say 5um and 10 um).I want to calculate energy deposited in big sphere(10um) if source is distributed in inner sphere(5 um) .What physics...

I am currently working on a FE simulation project where a tensile test of DP800 steel is subjected to cyclic loading. It utilizes Yoshida Uemori model (YUM) to formulate the modulus of elasticity (E) to simulate the hysteresis caused by cyclic loading. We are using a USDFLD subroutine in...

I was looking for a respond on moving mesh using COMSOL, while I was searching on Google I found a response in your forum.

Hello! i need help in such case. I want to simulate the interaction of gamma photons with only oxygen (O) atoms in MCNP, while am using the material card for silicon dioxide (SiO2). Which card shall I use to get the photon interacted with only the oxygen component separately. Thanks for help.

Hello! I'd like to model the impact of an object on an inflated air cushion (effectively an airbag) at rest in LS-DYNA, however all the tutorials I see start from a deflated airbag. I would like to skip this computation if possible to save computing time, since I would have to run the simulation...

Hello! I want to simulate a 2 level system in which the 2 levels are connected by an off-diagonal Hamiltonian term. I can linearly tune the distance between the 2 levels and thus I can transfer population from one to the other using a Landau–Zener transition. However, I want to add noise to this...

Hello, I'm a student, working on project related to electric motor. Currently I'm trying to simulate a 350W power axial flux motor on Ansys Maxwell 3D. Until now I have been able to get BEMF of motor, further I'm trying to find losses in motor like core losses & copper losses. The core loss data...

Hello everyone I simulated the eddy current brake of 2 1000-turn coils with 5 amp excitation in Ansys Maxwell, but the torque fluctuates. How can I overcome this problem? If you want to see it in more detail, you can download the project from the link. "" (Sorry for any language errors)

Was reading about a simulation and there isn't any mention about what amount of time it takes to start and to run. Since they're potentially on a supercomputer, maybe not a long time. I have no idea what to expect though. Do you sit at it like a regular desktop and press play, then it starts...

I am using Multisim software and I am comparing my calculated voltage gain with the one, done by Multisim. Why is calculated Av ( -478.8 mV) much different from the one in simulation ( -990 mV) ? I see the calculated is approx. half size of simulated. I tried using virtual transistor instead...

I'm trying to make a 2D game on Unity similar to Universe Sandbox 2. I currently am working with a star and planet, both with roughly the masses of the sun and earth respectively for comparison and at a distance of 31,000,000km. My current model uses Newton's formula for gravitational force (F...

Hello, I need to carry some simulations for my master's project and my tutor doesn't know much about simulations. I can't tell much since it is related with a private company but basically I'll have to simulate and measure the radiation emitted by some enriched uranium particles or uranium...

Verlet Algorithm with periodic conditions

I have been banging my head against this for a few weeks now; tweaking the simulation, adjusting my calculations, and searching around the web to try to find an answer. I can't post questions on CERN's Fluka help forum so this seemed like the best option. I really appreciate any help you can...

i have created the circuit but i am not sure what to do from here, this program is new to me

I have compared my simulation results with the experiments I conducted in the laboratory. Here I want to add a background for the graph I obtained from the simulation. Can I do it? I would be very happy if you could help me. I used MCBEND as the simulation program.

my issue here is what would i put in for frequency ? unless i use the formula to find the resonance frequency i have only used multisim live and you cant put in Vs 10 +j20

so this is a question i am trying to solve and then confirm with the simulation, so far i have.. Lamp load IL = PL/VL 1/6 = 0.1667A Thevenin resistance Rth = Rs1 || Rs 2 = 2 x 4 / 2 +4 = 1.333ohms Vth = 12V look at node voltage with load circuit and use kcl V = 6V Is1 = 12 -6 / 2 = 3A Is2 =...

How do i simulate the PWM signal with duty from 0% to 100% in Ltspice. I can generate a pwm signal with single duty.

Do I need to apply normalization these two graphs to make them similar to each other and if so, how can I do this? I would be very grateful if you can help me if these results are consistent. I compared the results of the experiment and the results of the mcbend simulation.

Hi guys, I'm new to this forum. I'd like to know how I could perform a simulation to find the induced EMF in a coil placed closer to a current-carrying conductor. I'm not sure how I should model the coil. I tried modelling it as a solenoid but the solenoid exceeds my required length when I enter...