Ahmed Khamayseh

Computer Science and Mathematics Division
Oak Ridge National Laboratory
Oak Ridge, TN 37831--6367

voice: (865) 241-4624
fax: (865) 574-0680
email: khamaysehak@ornl.gov
http://www.csm.ornl.gov/~ahmed

Education

Ph.D. in Mathematical Sciences, Minor in Aerospace Engineering, Mississippi State University, Mississippi, 1994.

M.S. in Mathematics, Mississippi State University, Mississippi, 1990.

B.S. in Mathematics, College of Science and Technology, Alquds University, Jerusalem, 1987.

Professional experience

March 2001 - Present. Senior Research Scientist, Computer Science and Mathematics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee.

February 2000 - January 2001. Senior Engineer, CFD Research Corporation, Huntsville, Alabama.

July 1996 - February 2000. Technical Staff Member, Applied Physics (X) Division, Los Alamos National Laboratory, Los Alamos, New Mexico.

July 1994 - July 1996. Postdoctoral Research Associate, Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, New Mexico.

January 1991 - May 1994. Research Associate, National Science Foundation Engineering Research Center, Mississippi State University, Mississippi.

Publications

Ahmed Khamayseh and Andrew Kuprat, ``Hybrid Curve Point Distribution Algorithms'', SIAM Journal on Scientific Computing, vol. 23, pp. 1464-1484 (2002).

Andrew Kuprat and Ahmed Khamayseh, ``Volume Conserving Smoothing for Piecewise Linear Curves, Surfaces, and Triple Lines'', Journal of Computational Physics, vol. 172, pp. 99-118 (2001).

Ahmed Khamayseh and Glen Hansen, ``Quasi-Orthogonal Grids with Impedance Matching'', SIAM Journal on Scientific Computing, vol. 22, pp. 1220-1237 (2000).

Gamal Elnagar and Ahmed Khamayseh, ``Numerical Solution of Nonstationary Aero-Autoelasticity Integro-Differential Operator Equations'', Journal of Mathematical Methods in the Applied Sciences, vol. 22, pp. 501-513 (1999).

Ahmed Khamayseh, and Andrew Kuprat, ``Surface Grid Generation Systems'', in Handbook of Grid Generation, eds. Joe Thompson et al., CRC Press, pp. 9.1-9.29 (1999).

Ahmed Khamayseh, Andrew Kuprat, and Wayne Mastin, ``Boundary Orthogonality in Elliptic Grid Generation'', in Handbook of Grid Generation, eds. Joe Thompson et al., CRC Press, pp. 6.1-6.26 (1999).

Gamal Elnagar and Ahmed Khamayseh, ``On the Optimal Spectral-Chebyshev Solution of a Controlled Nonlinear Dynamical System'', IMA Journal of Applied Mathematics, vol. 58, pp. 147-157 (1997).

Ahmed Khamayseh, ``A Generalized Elliptic Grid Generation System for Anisotropic Domains'', Center for Nonlinear Studies Newsletter, Los Alamos National Laboratory, No. 127, pp. 1-14 (1996).

Ahmed Khamayseh, Frank Ortega, and Harold Trease, ``Ray Tracing for Point Distribution in Unstructured Grid Generation'', Proceedings of the Fifth International Conference on Numerical Grid Generation in Computational Fluid Dynamics and Related Fields, pp. 257-267 (1996).

Ahmed Khamayseh and Andrew Kuprat, ``Anisotropic Smoothing and Solution Adaption for Unstructured Grids'', International Journal for Numerical Methods in Engineering, vol. 39, pp. 3163-3174 (1996).

Ahmed Khamayseh and Wayne Mastin, ``Computational Conformal Mapping for Surface Grid Generation'', Journal of Computational Physics, vol. 123, pp. 394-401 (1996).

Ahmed Khamayseh and Bernd Hamann, ``Elliptic Grid Generation Using NURBS Surfaces'', Computer Aided Geometric Design, vol. 13, pp. 369-386 (1996).

Ahmed Khamayseh and Wayne Mastin, ``Surface Grid Generation based on Elliptic PDE Models'', Applied Mathematics and Computation, vol. 65, pp. 253-264 (1994).

Wayne Mastin and Ahmed Khamayseh, ``Elliptic Grid Generation on Surfaces'', Advances in Hydro-Science and Engineering, vol. 1, pp. 2016-2022 (1993).

Ahmed Khamayseh and R. Shivaji, ``Evolution of Bifurcation Curves for Semi-Positone Problems When Non-Linearities Develop Multiple Zeroes'', Applied Mathematics and Computation, vol. 52, pp. 173-188 (1992).

Colloquia

``Conformal Grid Generation for Computational Simulation''. Oak Ridge National Laboratory, Oak Ridge, Tennessee, February 2001.

``Jacobian-Weighted Surface Grid Smoothing''. SIAM Annual Meeting, Puerto Rico, July 2000.

``Grid Generation on Boundary Representation Models''. CFD Research Corporation, Huntsville, Alabama, December, 1999.

``Orthogonal Grid Generation with Impedance Matching''. Argonne National Laboratory, Argonne, Illinois, June 1999.

``Adaptive Finite Element Method for Conservation Laws ''. University of South Carolina, Spartanburg, South Carolina, April 1999.

``Non-Parametric Volume Conserving Smoothing''. Sixth International Conference on Numerical Grid Generation in Computational Field Simulations, London, England, July 1998.

``Surface Grid Generation Systems''. Los Alamos National Laboratory, Los Alamos, New Mexico, May 1998.

``Adaptive Surface Grid Generation''. SIAM Annual Meeting, Kansas City, Kansas, July 1996.

``Ray Tracing for Point Distribution in Unstructured Grid Generation''. Fifth International Conference on Numerical Grid Generation in Computational Fluid Dynamics and Related Fields. Mississippi State University, Mississippi, April 1996.

``A Grid Generation Paradigm Based on NURBS and CSG Modeling''. Los Alamos National Laboratory, Los Alamos, New Mexico, March 1996.

``Quasielliptic Smoothing for Unstructured Grids''. Workshop on Surface Modeling and Related Issues in CFD Solutions, NASA Lewis Research Center, Cleveland, Ohio, May 1995.

``Time-Dependent Dynamic Grid Generation''. Differential Equations and Computational Simulations Conference, Mississippi State University, Mississippi, April 1995.

``An Algorithm for Hybrid Grid Generation''. Differential Equations and Computational Simulations Conference, Mississippi State University, Mississippi, April 1995.

``Survey on Nonuniform Rational B-Splines (NURBS)''. Los Alamos National Laboratory, Los Alamos, New Mexico, December 1994.

``Quasiconformal Mappings and Grid Generation''. Department of Mathematical Sciences, San Diego State University, San Diego, California, November 1994.

``Interactive Automated Surface and Volume Grid Generation''. Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, New Mexico, November 1994.

``Generation of Structured Grids on NURBS Surfaces''. Los Alamos National Laboratory, Los Alamos, New Mexico, March 1994.

``Surface Generating System based on Elliptic PDE Models''. Differential Equations and Computational Simulations Conference, Mississippi State University, Mississippi, March 1993.

``Bifurcation Curves for a Class of Semi-Positone Problems''. 67-th Annual Joint Meeting MAA, Lake Charles, Louisiana, February 1990.

``An Existence and Uniqueness Result for A Two Point Semi-Positone Boundary Value Problem''. 66-th Annual Joint Meeting MAA, Biloxi, Mississippi, February 1989.

Technical Reports

Ahmed Khamayseh and Andrew Kuprat, ``A Hybrid Analytic and Discrete Computation of Transit Times'', Los Alamos Technical Report (1997).

William Hachfeld, Ahmed Khamayseh, and Glen Hansen, ``Rigel: An Interactive Structured Grid Generation System'', Los Alamos Technical Report (1997).

Jacob Anderson, Ahmed Khamayseh, and Brian Jean, ``Adaptive Resolution Refinement for High-Fidelity Continuum Parameterizations'', Los Alamos Technical Report (1996).

Ahmed Khamayseh and Wayne Mastin, ``Quasiconformal Grid Generation'', Los Alamos Technical Report (1995).

Ahmed Khamayseh, Frank Ortega, and Andrew Kuprat, ``A Robust Point Location Algorithm for General Polyhedra'', Los Alamos Technical Report (1995).

Thesis and Dissertation

``Positive Solutions for Classes of Semi-Positone Boundary Value Problems''. Master's Thesis, Mississippi State University, Mississippi, May 1990.

``Elliptic Surface Grid Generation on Analytically Defined Geometries''. Ph.D. Dissertation, Mississippi State University, Mississippi, May 1994.

Research Interests

Applied Mathematics, Differential Geometry, Numerical Analysis, Numerical Solution of Partial Differential Equations Arising in Physics.

Computational Geometry, Computational Grid Generation, Computational Fluid Dynamics.

Journal Reviews

Journal of Computational Physics

Journal of Computers and Mathematics with Applications

Journal of Heat Transfer

International Journal for Numerical Methods in Engineering

Journal of Differential Equations

Journal of Engineering with Computers

Journal of Applied Mathematics Letters

Awards and Honors

NASA Postgraduate Scholarship, NASA Langley Research Center, 1991-1994.

Director's Postdoctoral Research Fellowship, Los Alamos National Laboratory, United States Department of Energy, 1994-1996.