structured quad mesh with transition zone - Computational Science Stack Exchange

I wonder which software can be used to generate the mesh like below. Anybody has an idea?

Inelasticity: Ultimate Load and Localized Failure

Photoionization of Na-like Si IV using R-matrix method

Energies, Free Full-Text

Energies, Free Full-Text

Structured Mesh - an overview

Machine-guided path sampling to discover mechanisms of molecular

Micromachines, Free Full-Text

SpatioTemporally Adaptive Quadtree Mesh (STAQ) Digital Image

Mesh generation

Frontiers Dry Textile Forming Simulations: A Benchmarking Exercise

Sensors, Free Full-Text

Sensors, Free Full-Text

The Best FEA Mesh Transition MSC Nastran – Simulating Reality, Delivering Certainty

Mesh Control Domains

Fillet edge at transition loft and mesh - Grasshopper - McNeel Forum

PDF] “CleanUp: Improving Quadrilateral Finite Element Meshes”

Vector halftone mesh texture. Abstract geometric seamless pattern with gradient transition effect, grid, net, weave, lattice. Black and white minimal repeat background. Monochrome design for decor Stock Vector