H
Hans Johansen
Researcher at Lawrence Berkeley National Laboratory
Publications - 37
Citations - 1461
Hans Johansen is an academic researcher from Lawrence Berkeley National Laboratory. The author has contributed to research in topics: Adaptive mesh refinement & Finite volume method. The author has an hindex of 12, co-authored 30 publications receiving 1231 citations. Previous affiliations of Hans Johansen include University of California, Berkeley.
Papers
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Journal ArticleDOI
A Cartesian Grid Embedded Boundary Method for Poisson's Equation on Irregular Domains
Hans Johansen,Phillip Colella +1 more
TL;DR: A numerical method for solving Poisson's equation, with variable coefficients and Dirichlet boundary conditions, on two-dimensional regions using a finite-volume discretization, which embeds the domain in a regular Cartesian grid.
Chombo Software Package for AMR Applications Design Document
Mark F. Adams,Phillip Colella,Daniel Graves,Jeffrey N. Johnson,Hans Johansen,Noel Keen,Terry J. Ligocki,Daniel F. Martin,P. McCorquodale,D. Modiano,P. O. Schwartz,T. D. Sternberg,B. van Straalen +12 more
TL;DR: Chombo Software Package for AMR Applications Design Document M. Ligocki, D. D. Sternberg, and B. Van Straalen Applied Numerical Algorithms Group Computational Research Division Lawrence Berkeley National Laboratory Berkeley, CA February 27, 2014.
Journal ArticleDOI
A Cartesian grid embedded boundary method for the heat equation on irregular domains
TL;DR: An algorithm for solving the heat equation on irregular time-dependent domains is presented, based on the Cartesian grid embedded boundary algorithm of Johansen and Colella, combined with a second-order accurate discretization of the time derivative.
Journal ArticleDOI
A Fourth-Order Accurate Finite-Volume Method with Structured Adaptive Mesh Refinement for Solving the Advection-Diffusion Equation
TL;DR: A fourth-order accurate algorithm for solving Poisson's equation, the heat equation, and the advection-diffusion equation on a hierarchy of block-structured, adaptively refined grids and is easily extensible to more complex physical systems.
Journal ArticleDOI
Physics–Dynamics Coupling in weather, climate and Earth system models: Challenges and recent progress
Markus Gross,Hui Wan,Philip J. Rasch,Peter M. Caldwell,David L. Williamson,Daniel Klocke,Christiane Jablonowski,Diana R. Thatcher,Nigel Wood,M. J. P. Cullen,Bob Beare,Martin Willett,Florian Lemarié,Eric Blayo,Sylvie Malardel,Piet Termonia,Piet Termonia,Almut Gassmann,Peter H. Lauritzen,Hans Johansen,Colin M. Zarzycki,Koichi Sakaguchi,Ruby Leung +22 more
TL;DR: In this article, the authors classified the resolved fluid dynamics, unresolved fluid dynamics and resolved fluid flow as resolved, unresolved and resolved components of a numerical weather, climate, or Earth system model.