[Paper Review] 0.333 in Tension, 0 in Compression — Where SPH Particles Start Pairing Up
·9 min read
The same SPH code holds under compression and pairs in tension. At h/dx = 1.2 the rate is 0.333; freezing the kernel on the initial lattice drives it to 0.
Saving Gradients on Unstructured Grids — Moving Least-Squares Approximation
·6 min read
With h=0.07, order 2 and 25 scattered points, the Taylor MLS derivative of sin(2πx) has RMSE 0.21, about 3% of the 2π amplitude.
SPH Without Tears — Solving Fluids with Particles, from Kernel to Artificial Viscosity
·7 min read
With γ = 7, Tait turns a 1% density error into a large pressure swing, and a pressure gradient that is not symmetrized leaks pair momentum.