Scientific computing
Numerical algorithms, conservative transfer, adaptive resolution, stability, verification, and reproducible computational experiments.
Independent research initiative
Computational applied mathematics, physics, remote sensing, and scientific computing.
Schraelbert Research is an independent research site maintained by Bjørn Wu, focused on numerical methods and computational approaches to problems in applied mathematics, physics, remote sensing, and geospatial data analysis.
Research LeadBjørn Wu
BackgroundPhD, Applied Mathematics
LocationOslo, Norway
Research
Computational methods across applied mathematics and physics.
Kinetic & multiscale methods
Discrete-velocity methods, Gauss–Hermite quadrature, nonequilibrium sensing, relaxation models, and adaptive velocity-space resolution.
Computational physics
Current and previous work spanning complex fluids, computational aerodynamics and aerothermodynamics, computational astrophysics, and computational quantum chemistry.
Remote sensing & geospatial computing
Satellite image processing, SAR/InSAR, geospatial data pipelines, inverse problems, environmental retrievals, and scientific software for Earth-observation applications.
scientific computingnumerical methodskinetic theory
rarefied flowsdiscrete velocity methodscomplex fluids
computational aerodynamicsaerothermodynamicscomputational astrophysics
computational quantum chemistrymathematical imagingimage processing
remote sensinggeospatial data processingSAR / InSAR
inverse problemsscientific softwareEarth observation
nonequilibrium transportmultiscale modellingadaptive methods
People
Researchers and collaborators.
Bjørn Wu
Independent Researcher
Research Lead
Email:
bjorn.de.wu [at] hotmail.com
Luna Zhang
Independent Researcher
Research Collaborator
Email:
luna.ve.zhang [at] hotmail.com
Selected work
Recent publications and preprints
A log-Gaussian scale-space limiter for hybrid continuum–ballistic gas dynamics
Open Transport 1(1), 20260023, 2026. A log-Gaussian continuum–ballistic blending framework for rarefied gas dynamics with DVM/BGK-informed calibration and shock-layer activation diagnostics.
DOI: 10.1515/ot-2026-0023 · arXiv:2607.12218 · Code/Data: 10.5281/zenodo.21940088 · GitHub repositoryTransport-Dominated Frame Error and a Conservative Low-Dissipation Correction on D3Q125
A numerical study separating collision-level frame robustness from full-solver frame error, identifying boost-dependent spatial dissipation as the dominant source in the tested regime, and introducing a conservative positivity-preserving low-dissipation correction.
DOI: 10.5281/zenodo.21935442Strictly causal adaptive Gauss–Hermite velocity resolution with conservative nonnegative remapping
A strictly causal global velocity-resolution promotion strategy with conservative nonnegative inter-set remapping and frozen-threshold validation.
DOI: 10.5281/zenodo.21938859Central-Hermite sensing and collision for frame-robust order-resolved relaxation on D3Q125
arXiv:2607.23629Hierarchical log-Gaussian relaxation on a fixed D3Q125 velocity set
arXiv:2607.20846About
Bjørn Wu
Bjørn Wu is an independent researcher based in Oslo, Norway, with a PhD in Applied Mathematics from the University of Bergen. His research spans computational applied mathematics and physics, with current emphasis on kinetic methods and scientific computing, alongside applied work in remote sensing, geospatial data processing, inverse problems, and scientific software.
Previous research and R&D experience includes mathematical imaging and image processing, satellite remote sensing, SAR/InSAR, environmental retrieval problems, geospatial processing pipelines, complex fluids, computational aerodynamics and aerothermodynamics, computational astrophysics, and computational quantum chemistry.
Schraelbert Research is an independent, non-institutional research initiative.
Contact
Research correspondence
Bjørn Wu
Research Lead · Schraelbert Research · Oslo, Norway
General contact: schraelbert.research [at] hotmail.com
Personal GitHub · @schraelbert