[Paper Review] Two Fragments Flew Together Instead of Pushing Apart — The 144° Equilibrium of a Mach 20 Sphere Pair
At Mach 20 two touching spheres align at one angle and generate lift together instead of repelling. A Newtonian approximation pins that angle down.
A 30° rigid rotation read -13% strain — conjugate stress-strain pairs in large-strain shells
Rotation alone fabricates strain in the engineering measure, and a wrong stress-strain pairing shifts the internal work rate by 5% or 54%.
The Weight Sits on Top and She Still Rights Herself — Metacentric Height and the Free Surface Effect
Whether a floating body capsizes is not decided by where the centre of gravity sits relative to the buoyancy centre. It is decided by the second moment of the waterplane.
Thinner Means Stiffer — Shear Locking in Shell Elements and the MITC Tying Fix
A linear shell element gets stiffer, not weaker, as it thins out. The cause is one line: shear strain obtained by differentiating displacements.
When a Bullet Passes Straight Through a Wall — Continuous Collision Detection by Inclusion Bisection
Stopping tunneling with CCD: coplanarity roots and conservative bisection
A Heart Valve Without a Body-Fitted Mesh — Peskin's Immersed Boundary Method and the Discrete Delta
How to put a moving body into a fluid without ever remeshing — one regularized delta function does the work