New answers tagged computational-physics
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Precession of Mercury (Python simulation)
It's quite easy to get the necessary precession for Mercury if you take gravitational and kinematic time dilation / length contraction into account.
The Newtonian acceleration vector is:
\begin{...
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Volume change of a deformable cylinder with a uniform spinning angular velocity
Materials are deformable volumetrically, so that, even if the cylinder is infinitely long (so that the axial strain is zero), it can still deform radially, and its cross sectional area and volume can ...
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Volume change of a deformable cylinder with a uniform spinning angular velocity
In theory this cylinder shouldn't change its cross sectional area or
volume as it spins with a uniform angular velocity.
That's not correct.
The material of the cylinder is in tension along its ...
- 71.8k
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Accepted
Solving partial differential equations using MacCormack scheme and to quantify in what situations this scheme is stable using von Neumann stability
You're looking to perform von Neumann stability analysis on the PDE. Essentially you will replace the variables of your PDE with your trial function with accounting for the increments in space/time ...
- 28.3k
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What is a stoquastic Hamiltonian?
One important thing you need to note is that the notion of stoquasticity is basis dependent. That is the single most tricky part in the definition, and once you are OK with that, the idea should be ...
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Tychonian Universe
but I cannot seem to use these and a coordinate transformation to find: $$r_{ME}=-r_{ES}(t)+r_{MS}(t)$$ to plot a graph that resembles image [1]
The problem seems to be that you are considering only ...
- 20k
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Solving divergence and curl equations numerically
No computers are required.
In ${\mathbb R}^3$ the field ${\bf E}$ satisfies ${\rm div}\,{\bf E}=0$ if and only if ${\bf E}= {\rm curl} \,{\bf A}$ for some vector field ${\bf A}$.
Similarly ${\bf E}$ ...
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Method of characteristics with coupled ODEs
Just a quick numerical test, to solve for $r(t),K(t)$ with Python (I assume $\gamma = 1/2, \omega=1$):
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Ball trajectory in the game of pétanque - unexpected drag results
You should be able to easily determine the drag experimentally by performing a simple vertical drop of the ball from a known height and timing the drop. Greater drop height gives better accuracy and ...
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In general relativity vizualizations what are the equations of grids?
Depictions of coordinate systems typically contain a set of geodesic with each coordinate held to a sequence of constant values. Cartesian coordinates are straight lines in flat space and equal time ...
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Dark matter and simulations of Modified Newtonian Dynamics
ProfRob has accurately explained why Newtonian gravity is sufficient to model galaxies. I am adding an answer only to address these points in particular:
People I ask tell me that there's no ...
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