The Weight Sits on Top and She Still Rights Herself — Metacentric Height and the Free Surface Effect
·8 min read
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
·7 min read
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
·7 min read
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
·5 min read
How to put a moving body into a fluid without ever remeshing — one regularized delta function does the work