# Questions tagged [simulations]

The imitation of a real-world process using an analogous process that is easier to control and experiment with.

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### Ising Model magnetisation

I am simulating the 2D Ising Model and specifically looking at the time evolution of magnetisation $m$. Now, in the non-equilibrium state, magnetisation will grow as a power law with time $t$, if ...
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### Accuracy of the Higuera-Cary Particle Pusher

UPDATE: 12 July 2024 This question has been answered. Also, I figured out the problem. One of the papers I was referencing (Ripperda et al.) had a typo, which was leading to the errors. The method is ...
1 vote
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### How do you solve instantaneous 3 body collisions

A few years ago I built myself a very basic python program that did some very basic collision mechanics between particles with a mass and velocity and it was helpful in learning a few things and ...
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### Finite Difference Modeling of MOSFET Device

Does anyone know of any references for MOSFET modeling done using the Finite Difference Method that they could point me to? I understand the gist of the operation, namely using Poisson's equation to ...
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1 vote
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### Vertical trajectory of a projectile with quadratic drag

I was wondering is there is an equation (or function) that can predict the apogee time and height of an object given its current acceleration and the usual constants ( mass, drag coefficient, cross ...
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### Distribution of scattered photons in cone-beam computed tomography (CBCT)

I am using MCGPU to simulate photon transport in cone-beam computed tomography (CBCT). I ran an experiment, where a water cylinder containing spherical objects was irradiated. The simulation software ...
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### Better equations for modeling and simulating a halo orbit?

I'm trying to model a halo orbit at low altitude (10m from surface). The satellite is using propulsion to trace the circular halo path. It looks like this "from the top" (the blue ball is ...
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### Is this the correct way to integrate orientation given torque and inertia tensor?

I am trying to develop a 3D rigid body simulation in C++ in which I had some conceptual doubts on how to integrate for orientation given the total torque applied to a rigid body, and it's initial ...
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### About how to calculate observables in Quantum Monte Carlo with complex weights

I'm rewriting a Diagrammatic Quantum Monte Carlo algorithm following Werner, P., Oka, T., & Millis, A. J. (2009). Diagrammatic Monte Carlo simulation of nonequilibrium systems. Physical Review B, ...
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### Initial condition of the millenium simulation

I would like to know the initial conditions used for the millenium simulation. More specifically, I would like to know the amplitude of the initial power spectrum $\mathcal{A}$. I have found the ...
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1 vote
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### Can the specific heat capacity in the Ising Model be negative?

Im working on a numerical method for the Ising model. I'm asked to calculate both the absolute magnetizetion and the specific heat capacity: c = \frac{\beta^2}{N} \left( \langle H^2 \rangle - \...
1 vote
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### Purcell Effect Without RWA

I am trying to simulate a coupled qubit-resonator system, and want to extract the Purcell decay rate of the qubit. For that, I initialise the qubit in state $\left|1\right>$ and fit the probability ...
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1 vote
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### Constrained Lagrangian simulation. Fails depending on constraint definition [closed]

Introduction I want to simulate a robotic leg that has a closed kinematic chain. The analytical equation i derived are compared with a simulink multibody model. Initially, my simulation failed, and ...
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### Calculating enthalpy of a solid as a function of temperature in Molecular Dynamics

I would like to get the enthalpy as a function of temperature for BCC lithium at zero pressure. I have performed a series of NVT simulations with 500 atoms using a Nose-Hoover thermostat at the ...
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