Lawrence Livermore National Laboratory

Lawrence Livermore National Laboratory


Louis H Howell


Email: howell4@llnl.gov
Phone: 925-422-6105

Mailing address:
Louis H Howell
Lawrence Livermore National Laboratory
Box 808, L-556
Livermore, CA 94551-0808

Louis Howell's research work is in scientific computing, including multigrid and multilevel algorithms, computational fluid dynamics, radiative heat transfer, and numerical conformal mapping. Currently he is working on an adaptive mesh refinement (AMR) implementation of radiation diffusion coupled to a gas dynamics algorithm. Louis writes primarily in C++, C or Fortran, depending on which is most appropriate to the task at hand. He is also familiar with a number of other languages, including some members of the Lisp family, and Louis occasionally writes in English.

Louis is a member of the Center for Applied Scientific Computing (CASC) at the Lawrence Livermore National Laboratory (LLNL). Previously he belonged to the Center for Computational Sciences and Engineering (CCSE), which was originally at LLNL, but which moved to the Lawrence Berkeley National Laboratory along with the National Energy Research Supercomputer Center (NERSC) in 1996.

Former Positions

Lawrence Berkeley National Laboratory, Berkeley, CA
Lawrence Livermore National Laboratory, Livermore, CA
Mathematician in Center for Computational Sciences and Engineering (formerly Computing and Mathematics Research Division), 2/90 to 12/97. (CCSE transferred intact from LLNL to LBNL on 3/1/96.) Research in adaptive mesh refinement techniques for elliptic problems, with applications to incompressible and low Mach number fluid dynamics. More recent research focused on radiative heat transfer, including discrete-ordinate methods and nonlinear flux-limited diffusion. Experience with implementing these methods in adaptive-mesh and embedded-boundary geometries.
Thinking Machines Corporation, Cambridge, MA
Consultant, 3/88 to 1/90. Developed numerical software, primarily graphics and CFD, in *Lisp, Lisp/Paris and C/Paris for use on the Connection Machine CM2.

Professional Memberships

Publications

L. H. Howell, R. B. Pember, P. Colella, J. P. Jessee and W. A. Fiveland, A conservative adaptive-mesh algorithm for unsteady, combined-mode heat transfer using the discrete ordinates method, Numerical Heat Transfer Part B 35 (1999), pp. 407-430.

M. M. Sussman, A. S. Almgren, J. B. Bell, P. Colella, L. H. Howell and M. Welcome, An adaptive level set approach for incompressible two-phase flows, Journal of Computational Physics 148 (1999), pp. 81-124.

R. B. Pember, L. H. Howell, J. B. Bell, P. Colella, W. Y. Crutchfield, W. A. Fiveland and J. P. Jessee, An adaptive projection method for unsteady, low-Mach number combustion Combustion Science and Technology 140 (1998), pp. 123-168.

J. P. Jessee, W. A. Fiveland, L. H. Howell, P. Colella and R. B. Pember, An adaptive mesh refinement algorithm for the radiative transport equation, Journal of Computational Physics 139 (1998), pp. 380-398. [Abstract]

J. K. Truelove, R. I. Klein, C. F. McKee, J. H. Holliman II, L. H. Howell, J. A. Greenough and D. T. Woods, Self-gravitational hydrodynamics with 3-D adaptive mesh refinement: methodology and applications to molecular cloud collapse and fragmentation, Astrophysical Journal 495 (1998), pp. 821-852.

J. K. Truelove, R. I. Klein, C. F. McKee, J. H. Holliman II, L. H. Howell and J. A. Greenough, The Jeans condition: a new constraint on spatial resolution in simulations of isothermal self-gravitational hydrodynamics, Astrophysical Journal 489 (1997), pp. L179-L183. [Abstract]

L. H. Howell and J. B. Bell, An adaptive-mesh projection method for viscous incompressible flow [hb96.ps.gz, 1022967 bytes], SIAM Journal on Scientific Computing 18 (1997), pp. 996-1013. [Abstract]

L. H. Howell, Numerical conformal mapping of circular arc polygons, Journal of Computational and Applied Mathematics 46 (1993), pp. 7-28. [Abstract]

D. Bertsimas and L. H. Howell, Further results on the probabilistic traveling salesman problem, European Journal of Operational Research 65 (1993), pp. 68-95. [Abstract]

L. H. Howell and L. N. Trefethen, A modified Schwarz-Christoffel transformation for highly elongated regions, SIAM Journal on Scientific and Statistical Computing 11 (1990), pp. 928-949. [Abstract]

L. H. Howell and L. N. Trefethen, Ill-posedness of absorbing boundary conditions for migration, Geophysics 53 (1988), pp. 593-603.

Conference Proceedings, Reports

L. H. Howell and J. A. Greenough, A block-structured adaptive mesh refinement algorithm for diffusion radiation, Proceedings of the Nuclear Explosives Code Development Conference, Las Vegas, NV, October 26-30, 1998.

R. B. Pember, L. H. Howell, J. B. Bell, P. Colella, W. A. Fiveland and J. P. Jessee, An adaptive projection method for the modeling of unsteady, low-Mach number combustion, 1997 Fall Meeting of the Western States Section of the Combustion Institute, Diamond Bar, CA, October 23-24, 1997 (WSS/CI 97F-125).

J. P. Jessee, L. H. Howell, W. A. Fiveland, P. Colella and R. B. Pember, An adaptive mesh refinement algorithm for the discrete ordinates method, Proceedings of the 1996 National Heat Transfer Conference, Houston, TX, August 3-6, 1996. [Abstract]

M. M. Sussman, A. S. Almgren, J. B. Bell, P. Colella, L. H. Howell and M. Welcome, An adaptive level set approach for incompressible two-phase flows, Proceedings of the ASME Fluids Engineering Summer Meeting, San Diego, CA, July 7-11, 1996. [Abstract]

R. B. Pember, A. S. Almgren, W. Y. Crutchfield, L. H. Howell, J. B. Bell, P. Colella and V. E. Beckner, An embedded boundary method for the modeling of unsteady combustion in an industrial gas-fired furnace, 1995 Fall Meeting of the Western States Section of the Combustion Institute, Stanford, CA, October 30-31, 1995 (WSS/CI 95F-165).

A. S. Almgren, J. B. Bell, P. Colella, L. H. Howell and M. Welcome, A high-resolution adaptive projection method for regional atmospheric modeling, Proceedings of the NGEMCOM Conference sponsored by the U.S. EPA, Bay City, MI, August 7-9, 1995. [Abstract]

R. B. Pember, A. S. Almgren, J. B. Bell, P. Colella, L. Howell and M. Lai, A higher-order projection method for the simulation of unsteady turbulent nonpremixed combustion in an industrial burner, Proceedings of the 8th International Symposium on Transport Phenomena in Combustion, San Francisco, CA, July 16-20, 1995.

A. S. Almgren, J. B. Bell, L. H. Howell and P. Colella, An adaptive projection method for the incompressible Navier-Stokes equations, Proceedings of the 14th IMACS World Congress, Atlanta, July 11-15, 1994, pp. 537-540. [Abstract]

L. H. Howell, Schwarz-Christoffel methods for multiply-elongated regions [sc94.ps.gz, 81954 bytes], Proceedings of the 14th IMACS World Congress, Atlanta, July 11-15, 1994, pp. 1300-1303. [Abstract]

A. S. Almgren, J. B. Bell, P. Colella and L. H. Howell, An adaptive projection method for the incompressible Euler equations, Proceedings of the 11th AIAA Computational Fluid Dynamics Conference, Orlando, July 6-9, 1993. [Abstract]

L. H. Howell, A multilevel adaptive projection method for unsteady incompressible flow [cm93.ps.gz, 248745 bytes], Proceedings of the 6th Copper Mountain Conference on Multigrid Methods, Copper Mountain, CO, April 4-9, 1993. [Abstract]

J. B. Bell, P. Colella and L. H. Howell, An efficient second-order projection method for viscous incompressible flow, Proceedings of the 10th AIAA Computational Fluid Dynamics Conference, Honolulu, June 24-27, 1991.

Thesis

Received Ph.D. in Applied Mathematics from MIT in February 1990, thesis work under Professor Lloyd N. Trefethen was on Computation of Conformal Maps by Modified Schwarz-Christoffel Transformations [lhhphd.ps 635673 bytes] [Abstract]. Louis still has printed copies of the thesis available.


Updated: 2008-05-13 15:46:55