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Error in Attempting Moving Boundary Fluid System

… why would the system be classified by NDSolveValue a differential-algebric system, since every variable has at least one differential term? This isn't quite ...
• 53.1k
Accepted

Fourth order, nonlinear PDE dipicting dynamics of liquid lenses

Yet another problem related to the hyperbolic conservation law. Based on the experience obtained in e.g. here, let's avoid symbolic expansion of D. I'll use ...
• 53.1k

3D Fourier transform of 1/r^2

There is a well known trick that makes this and some related problems relatively straightforward. Namely, using the identity: $\frac{1}{r}=\int_{0}^{\infty}e^{-tr}dt$ and rearranging the order of ...

Using WhenEvent to stop N objects at a boundary

Here is the solution. Thanks to @Michael E2 in original question comments. ...
• 127

3D Fourier transform of 1/r^2

Another easy way: ...
• 11.3k
1 vote
Accepted

3D Parametric Plotting for N Charged Particles in a Nonuniform Electric Field

Your initial conditions are lists with 1 element, but numbers are expected. E.g. instead of x1[j][0] == pos0[[j, 1, ]] write x1[j][0] == pos0[[j, 1, 1]]
• 25.1k

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