Karim Shariff

Aerospace Engineer, NASA Ames Research Center (ARC)
Computational Physics Branch
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Ph.D. in Mechanical Engineering, Stanford Univ. 1989, Thesis: Dynamics of a Class of Vortex Rings: Report, Advisors: J. H. Ferziger & A. Leonard
M.S. in Mechanical Engineering, Stanford Univ. 1983
B.S. in Aerospace Engineering, UCLA, 1982

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Research/Technical Interests

Vortex Dynamics, Lagrangian Coherent Structures, Aeroacoustics, Turbulence Simulation, Numerical Method Development, Protoplanetary Disks

Publications

Journal Articles

K. Shariff & O.M. Umurhan, A High-resolution Simulation of Protoplanetary Disk Turbulence Driven by the Vertical Shear Instability, Ap. J., 977:272 (27 pp.), 2024.
Karim Shariff, PADÉ: A Code for Protoplanetary Disk Turbulence Based on Padé Differencing, Published by the American Astronomical Society. The Astrophysics Journal Supplement Series, Volume 273, Number 2 August 8, 2024. Pade: A code for protoplanetary disk turbulence based on Pade differencingPreprint Video Interview with Karim Shariff discussing Pade code
K. Shariff, U. Gorti & J.D. Melon Fuksman, Protostellar discs subject to infall: a one-dimensional inviscid model and comparison with ALMA observations, Monthly Notices of the Royal Astronomical Society, Volume 514, Issue 4, August 2022, Pages 5548–5569. Protostellar discs subject to infall: a one-dimensional inviscid model and comparison with ALMA observations Preprint
K. Shariff & G. Elsinga (2021), Viscous vortex layers subject to more general strain and comparison to isotropic turbulence, Phys. Fluids, vol. 33, Issue 3, 033611 (8 pp.). | Viscous vortex layers subject to more general strain and comparison to isotropic turbulence (preprint) Preprint
D. Seligman & K. Shariff (2019), Investigation of a Vorticity-preserving Scheme for the Euler Equations, Ap. J. 877:113 (9pp). | Investigation of a Vorticity-preserving Scheme for the Euler Equations (preprint)Preprint
K. Shariff & A. Wray (2018), The Fargo Method for Keplerian Advection: Error Analysis and Correction, Ap. J. 238: 12 (11pp). | The Fargo Method for Keplerian Advection: Error Analysis and Correction (preprint)Preprint | The Fargo Method for Keplerian Advection: Error Analysis and Correction (movie)Movie
K. Shariff & P.S. Krueger (2018), Advective balance in pipe-formed vortex rings, J. Fluid Mech., 836, 773-796. | Advective balance in pipe-formed vortex rings (preprint)Preprint
K. Shariff (2016), Making aircraft vortices visible to radar by spraying water into the wake, J. Atmos. Oceanic. Tech., 33, 2615-2638. | Making aircraft vortices visible to radar by spraying water into the wake (preprint)Preprint | Making aircraft vortices visible to radar by spraying water into the wake (supplemental material)Supplemental Material
O. M. Umurhan, K. Shariff, & Cuzzi, J. (2016), Critical layers and protoplanetary disk turbulence, Ap. J. 830:95 (24 pp.). | Critical layers and protoplanetary disk turbulence (preprint)Preprint
R. Paoli & K. Shariff (2016), Contrail modeling and simulation, Ann. Rev. Fluid Mech., 48, 393-427.
K. Shariff & Cuzzi, J (2015), The spherically symmetric gravitational collapse of a clump of particles in a gas, Ap. J., 805:42:1-18. | The spherically symmetric gravitational collapse of a clump of particles in a gas (preprint) Preprint
S. K. Jee & K. Shariff (2014), Detached-eddy simulation based on the v²-f model, Intl. J. Heat & Fluid Flow, 46, 84-101.
K. Shariff & Manning, T. (2013), A ray tracing study of shock leakage in a model supersonic jet, Phys. Fluids, 25, 076103:1-20.
T. Nishino & K. Shariff (2012), Effect of jet nozzle lip momentum loss on circulation control airfoil performance, AIAA J., 50, 551-58.
K. Shariff & J. Cuzzi (2011), Gravitational instability of solids assisted by gas drag: slowing by turbulent mass diffusivity, Ap. J. 738, 73:1-9. | Gravitational instability of solids assisted by gas drag: slowing by turbulent mass diffusivity (preprint)Preprint
T. Nishino, S. Hahn, & K. Shariff (2010), Large-eddy simulations of a turbulent Coanda jet on a circulation control airfoil, Phys. Fluids, 22, 125105:1-15.
T. Nishino & K. Shariff (2010), Numerical investigation of wind tunnel side-wall effects on flow around a circulation control airfoil. AIAA J., 48, 2123-2132.
K. Shariff (2009), Fluid mechanics of disks around young stars. Ann. Rev. of Fluid Mech. 41, 283-315. | Fluid mechanics of disks around young stars (supplementary material)Supplementary Material
R. Paoli & K. Shariff (2009), Turbulent condensation of droplets: direct simulation and a stochastic model. J. Atmos. Sci. 66, 723-740.
J.N. Cuzzi, R. C. Hogan, & K. Shariff (2008), Towards planetesimals: dense chondrule clumps in the protoplanetary nebula. Ap. J. 687, 1432-1447.
K. Shariff, A. Leonard, & J. H. Ferziger (2008), A contour dynamics algorithm for axisymmetric flow. J. Comp. Phys. 227, 9044-9062. | A contour dynamics algorithm for axisymmetric flow (preprint)Preprint
K. Shariff, A. Leonard, & J. H. Ferziger (2006), Dynamical systems analysis of fluid transport in time-periodic vortex ring flows. Phys. Fluids 18, 047104:1-11. | A contour dynamics algorithm for axisymmetric flow (preprint)Preprint
K. Shariff & M. Wang (2005), A numerical experiment to determine whether surface shear-stress fluctuations are a true sound source. Phys. Fluids 17, 107105:1-11.
K. Shariff, S. Ghosal, & A. Matouschek (2004), The force exerted by the membrane potential during protein import into the mitochondrial matrix. Biophys. J. 86, 3647-52.
K. Shariff & S. Ghosal (2004), Peak tailing in electrophoresis due to alteration of the wall zeta-potential by adsorbed analytes: numerical simulations and asymptotic theory. Analytica Chimica Acta 507, 87-93.
O. Botella & K. Shariff (2002), B-spline methods in fluid dynamics. Intl. J. of Comp. Fluid Dyn. 17, 133-149.
K. Shariff & A. Wray (2002), Analysis of the radar reflectivity of aircraft vortex wakes. J. of Fluid Mech. 463, 121-161.
P. Orlandi, G. F. Carnevale, S. K. Lele & K. Shariff (2001), Thermal perturbation of trailing vortices. Eur. J. Mech. 20, 511-524.
S. Guarini, R. D. Moser, K. Shariff & A. Wray (2000), Direct Numerical Simulation of a Supersonic Turbulent Boundary Layer at Mach 2.5, J. of Fluid Mech. 414, 1-33. | Direct Numerical Simulation of a Supersonic Turbulent Boundary Layer at Mach 2.5 (preprint)Preprint
A.G. Kravchenko, P. Moin & K. Shariff (1999), B-spline method and zonal grids for simulations of complex turbulent flows. J. Comp. Phys. 151, 757-789.
K. Shariff & R.D. Moser (1998), Two-Dimensional Mesh Embedding for B-spline Methods, J. Comp. Phys. 145, 471-488. | Two-Dimensional Mesh Embedding for B-spline Methods (preprint)Preprint
M. Gharib, E. Rambod, K. Shariff (1998), A universal time scale for vortex ring formation. J. of Fluid Mech. 360, 121-140.
N. A. Adams & K. Shariff (1996), A high resolution hybrid compact-ENO scheme for shock-turbulence interaction problems. J. of Comp. Phys. 127, 27-51.
K. Marten, K. Shariff, S. Psarakos & D. White (1996), The ring bubbles of dolphins. Scientific American 275, No. 2 (Aug.) 65-69.
K. Shariff, R. Verzicco & P. Orlandi (1994), A numerical study of three-dimensional vortex ring instabilities: viscous corrections and early non-linear stage. J. Fluid Mech., 279, 351-375.
W. M. Chan, K. Shariff & T. H. Pulliam (1993), Instabilities of two-dimensional inviscid compressible vortices. J. Fluid Mech. 253, 173-209.
K. Shariff & A. Leonard (1992), Vortex rings. Ann. Rev. Fluid Mech. 24, 235-279.
K. Shariff, A. Leonard, N.J. Zabusky & J. H. Ferziger (1988), Acoustics and dynamics of coaxial interacting vortex rings. Fluid Dyn. Res. 3, 33.

Reports & Conference Proceedings Not Represented Above

K. Shariff, A. Leonard & J. H. Ferziger (1989), Dynamics of a class of vortex rings, NASA TM 102257, Also, Dissertation, Dept. Mechanical Engineering, Stanford Univ. Report
K. Shariff, T.H. Pulliam &J.M. Ottino (1991), A dynamical systems analysis of kinematics in the time-periodic wake of a circular cylinder. In Vortex Dynamics and Vortex Methods (eds. C.R. Anderson &C. Greengard), Lectures in Appl. Math. 28, 613-646.
T. Nishino & K. Shariff (2009), Direct numerical simulation of a swept-wing boundary layer with an array of discrete roughness elements, In Proc. 7th IUTAM Symposium on Laminar-Turbulent Transition, Stockholm, Sweden, 23-26 June, 6pp.
S. K. Balakrishnan & K. Shariff (2016), Detached-eddy simulation of flap side-edge flow. AIAA Paper 2016-1074, 54th AIAA Aerospace Sciences Meeting, San Diego, Calif. | Detached-eddy simulation of flap side-edge flow (preprint) Preprint
Center for Turbulence Research, Summer School Proceedings & Annual Briefs Not Represented Above
R. Paoli, K. Shariff, & A. Shirgaonkar (2006), Analysis of a subgrid-scale model for turbulent condensation. Proc. Summer Program, pp. 259-267.
R. Paoli, Poinsot, T. & K. Shariff (2006), Testing semi-Lagrangian schemes for two phase flow applications. Proc. Summer Program, pp. 213-222.
R. Paoli & K. Shariff (2003), Particle size distributions in atmospheric clouds. Annual Research Briefs, pp. 39-47.
G. A. Blaisdell & K. Shariff (1996), Simulation and modeling of the elliptic streamline flow, Proc. 1996 Summer Program, pp. 433-446.
G. A. Blaisdell & K. Shariff (1994), Homogeneous turbulence subjected to mean flow with elliptic streamlines, Proc. Summer Program, pp. 355-371.
R. Verzicco & K. Shariff (1994), Vortex ring instability and its sound. Proc. Summer Program, pp. 221-228.
S. Stanaway, K. Shariff & F. Hussain (1988), Head-on collision of viscous vortex rings, Proc. CTR Summer Program, pp. 287-309.
J. Weinstock & K. Shariff (1987), Evaluation of a theory for pressure-strain rate, Proc. CTR Summer Program, pp. 213-220.

Presentations of Work not Represented Above

T. Ferreira, D.-G. Caprace, R. Paoli, K. Shariff, S.K. Lele, Can inducing the Crow instability reduce contrail radiative forcing?, Proc. Summer Program 2024, Center for Turbulence Research, Stanford Univ.
K. Shariff, Analysis of preferential particle concentration. Bull. Amer. Phys. Soc. 53, No. 15, p. 201 (2008).
G. A. Blaisdell, J. H. Qin and K. Shariff, A study of two-equation turbulence models on the elliptic streamline flow. Bull. Amer. Phys. Soc. 40 (1995), p. 2043.
K. Shariff, G. A. Blaisdell, R. Abid and C.G. Speziale, Numerical experiments on homogeneous strained turbulence subjected to coriolis force. Bull. Amer. Phys. Soc. 40 (1995), p. 1973.
K. Shariff, J. H. Ferziger & A. Leonard, An elliptical core model for vortex ring interactions. Bull. Amer. Phys. Soc. 31 (1986) p. 1735.