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Draft:Marius Ungarish

From Wikipedia, the free encyclopedia

Marius Ungarish
Born1951 (age 74–75)
Romania
CitizenshipIsraeli
EducationTechnion – Israel Institute of Technology
Known forGravity currents and intrusions; centrifugal separation of suspensions
Scientific career
FieldsApplied mathematics, fluid dynamics
Workplaces
Thesis Combination of Asymptotic and Numerical Methods for the Investigation of Rotating Compressible Flows in a Cylinder for Small Rossby and Ekman Numbers  (1980)
Moshe Israeli
Websitecsaws.cs.technion.ac.il/~unga/

Marius Ungarish (born 1951) is a Romanian-born Israeli applied mathematician and fluid dynamicist. He is Professor Emeritus in the Taub Faculty of Computer Science at the Technion – Israel Institute of Technology,[1][2] where he was a full professor and held the George Farkas Chair in Computer Science.[3][4] His research has focused on rotating and two-phase flows, centrifugal separation of suspensions, and gravity currents and intrusions. He has written three monographs on these subjects.[5][6][7]

Early life and education

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Ungarish was born in Romania in 1951. He studied at the Technion in Haifa, receiving a B.Sc. cum laude in aeronautical engineering in 1972 and a D.Sc. in applied mathematics in 1980.[4] His doctoral thesis, supervised by Moshe Israeli, combined asymptotic and numerical methods for the analysis of rotating compressible flow in a cylinder at small Rossby and Ekman numbers.[4]

Career

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From 1972 to 1986, Ungarish worked as a research engineer on problems including aeronautics, flight-system simulation and computational fluid dynamics. He headed a computational fluid dynamics group from 1978 to 1981 and an applied mathematics division from 1983 to 1986.[4]

From 1981 to 1983 he was at the Massachusetts Institute of Technology, first as an instructor and then as a lecturer in applied mathematics, while carrying out postdoctoral research with Harvey P. Greenspan on rotating and two-phase flows. He subsequently continued this collaboration as a consultant at MIT from 1985 to 1989.[4]

Ungarish joined the Technion's Computer Science Department as a senior lecturer in 1986. He became an associate professor in 1989 and a full professor in 1997, and was awarded the George Farkas Chair in Computer Science in 2003. He became Professor Emeritus in 2020.[4][1]

His visiting appointments have included a visiting professorship at the University of the Witwatersrand in 1989–1990, an EPSRC Visiting Fellowship in the Department of Applied Mathematics and Theoretical Physics at the University of Cambridge in 1996–1997, visiting professorships at the Institut National Polytechnique de Grenoble in 2000–2001, the University of Florida in 2008–2009 and National Taiwan University in 2012–2013, a Benjamin Meaker Visiting Professorship at the University of Bristol in 2017, and visiting research appointments at Princeton University in 2018 and 2019.[4]

Since 2011 he has served on the editorial board of the journal Environmental Fluid Mechanics.[4]

Research

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Rotating and two-phase flows

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Ungarish's early research concerned rotating fluids and the dynamics of particle–fluid mixtures, including the centrifugal separation of suspensions. With Greenspan, he developed models of two-phase flow and centrifugal separation in rotating containers. Their work included the separation of mixtures containing particles of different sizes and the dynamics of rotating boundary layers.[8] This body of work was synthesized in his 1993 monograph Hydrodynamics of Suspensions.[5]

Related work treated compressible rotating flows by combined asymptotic and numerical methods,[9] as well as the flow and drag generated by particles moving along the axis of a rotating fluid.

Gravity currents and intrusions

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From the late 1990s, a major focus of Ungarish's research became gravity currents—predominantly horizontal flows driven by density differences—and intrusions, which propagate within a stratified fluid near a level of neutral buoyancy. In work with Herbert Huppert, he investigated the effects of rotation on axisymmetric gravity currents using shallow-water models, asymptotic analysis and experiments.[10]

Ungarish subsequently developed shallow-water and box-model descriptions for gravity currents and intrusions in a range of configurations. These include currents propagating through stratified ambients, non-Boussinesq currents with large density differences, particle-driven currents, flows over porous boundaries and slopes, continuously supplied currents, and currents in channels with non-rectangular cross-sections.[6][7] He also contributed a survey chapter on gravity currents and intrusions to the Handbook of Environmental Fluid Dynamics.[11]

A recurring part of this work has been the extension of Thomas B. Benjamin's classical theory for the front speed of a gravity current. In 2006, Ungarish generalized Benjamin's steady-state result from a homogeneous ambient fluid to a linearly stratified ambient.[12] Later work extended related front conditions to other geometries and free-surface configurations and developed a unified treatment of gravity-current fronts and internal jumps.[13]

The theoretical models have been compared with laboratory experiments and with numerical solutions of the Navier–Stokes equations. For example, a 2002 study with Huppert found agreement between shallow-water predictions, experiments and finite-difference Navier–Stokes simulations for gravity currents propagating beneath a stratified ambient.[14] Subsequent direct numerical simulations by collaborators tested predictions of his theory for stratified currents.[15]

Ungarish has continued to publish on gravity currents after becoming emeritus. Recent work has included models of Newtonian and power-law viscous currents confined between plates, including surface-tension effects,[16] and the propagation of gravity currents down slopes through stratified ambient fluids.[17]

Books

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Ungarish is the author of three research monographs:

  • Hydrodynamics of Suspensions: Fundamentals of Centrifugal and Gravity Separation (Springer-Verlag, 1993).[5]
  • An Introduction to Gravity Currents and Intrusions (CRC Press, 2009).[6]
  • Gravity Currents and Intrusions: Analysis and Prediction (World Scientific, 2020).[7]

Hydrodynamics of Suspensions was reviewed in the International Journal of Multiphase Flow and in the Journal of Fluid Mechanics; the latter review described the book as fulfilling the need for a summary of the field and noted the author's own contributions to it.[18][19]

An Introduction to Gravity Currents and Intrusions was independently reviewed in both the Journal of Fluid Mechanics and the International Journal of Multiphase Flow.[20][21]

Awards and honours

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Ungarish received the Landau Award of Mifal HaPayis for his doctoral research in 1980, a Rothschild Fellowship for postdoctoral research at MIT in 1981–1982, a Bantrell Fellowship at MIT in 1982–1983, the Taub Award in Computer Science from the Technion in 1991, and an EPSRC Fellowship for research at Cambridge in 1996–1997.[4] His 1981 Rothschild Fellowship is listed in the Rothschild Foundation's published register of fellows, under Computer Sciences.[22] In 2003 he was awarded the George Farkas Chair in Computer Science at the Technion.[4][3]

Selected publications

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  • Ungarish, Marius; Greenspan, Harvey P. (1984). "On centrifugal separation of particles of two different sizes". International Journal of Multiphase Flow. 10 (2): 133–148. doi:10.1016/0301-9322(84)90012-0.
  • Ungarish, Marius; Huppert, Herbert E. (1998). "The effects of rotation on axisymmetric gravity currents". Journal of Fluid Mechanics. 362: 17–51. doi:10.1017/S0022112098008878.
  • Ungarish, Marius; Huppert, Herbert E. (2002). "On gravity currents propagating at the base of a stratified ambient". Journal of Fluid Mechanics. 458: 283–301. doi:10.1017/S0022112002007978.
  • Ungarish, Marius (2006). "On gravity currents in a linearly stratified ambient: a generalization of Benjamin's steady-state propagation results". Journal of Fluid Mechanics. 548: 49–68. doi:10.1017/S0022112005007421.
  • Ungarish, Marius; Hogg, Andrew J. (2018). "Models of internal jumps and the fronts of gravity currents: unifying two-layer theories and deriving new results". Journal of Fluid Mechanics. 846: 654–685. doi:10.1017/jfm.2018.219.

References

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  1. 1 2 "Emeritus Faculty". The Taub Faculty of Computer Science, Technion – Israel Institute of Technology. Retrieved 14 September 2026.
  2. ↑ The Faculty of Computer Science Curriculum Catalog 2025–2026 (PDF) (Report). Technion – Israel Institute of Technology. 2025. p. 4. Retrieved 14 September 2026.
  3. 1 2 "Professor Marius Ungarish". Department of Computer Science, Technion – Israel Institute of Technology. Retrieved 14 September 2026.
  4. 1 2 3 4 5 6 7 8 9 10 Ungarish, Marius (March 2026). "Curriculum Vitae" (PDF). Technion – Israel Institute of Technology. Retrieved 14 September 2026.
  5. 1 2 3 Ungarish, Marius (1993). Hydrodynamics of Suspensions: Fundamentals of Centrifugal and Gravity Separation. Springer-Verlag. doi:10.1007/978-3-662-01651-0. ISBN 3-540-54762-2.
  6. 1 2 3 Ungarish, Marius (2009). An Introduction to Gravity Currents and Intrusions. CRC Press. doi:10.1201/9781584889045. ISBN 978-1-58488-903-8.
  7. 1 2 3 Ungarish, Marius (2020). Gravity Currents and Intrusions: Analysis and Prediction. World Scientific. doi:10.1142/11986. ISBN 978-981-12-2594-9.
  8. ↑ Ungarish, Marius; Greenspan, Harvey P. (1984). "On centrifugal separation of particles of two different sizes". International Journal of Multiphase Flow. 10 (2): 133–148. doi:10.1016/0301-9322(84)90012-0.
  9. ↑ Ungarish, Marius; Israeli, Moshe (1985). "Axisymmetric compressible flow in a rotating cylinder with axial convection". Journal of Fluid Mechanics. 154: 121–144. doi:10.1017/S0022112085001458.
  10. ↑ Ungarish, Marius; Huppert, Herbert E. (1998). "The effects of rotation on axisymmetric gravity currents". Journal of Fluid Mechanics. 362: 17–51. doi:10.1017/S0022112098008878.
  11. ↑ Ungarish, Marius (2013). "Gravity Currents and Intrusions". In Fernando, Harindra Joseph S. (ed.). Handbook of Environmental Fluid Dynamics. Vol. 1. CRC Press. ISBN 978-1-4398-1669-1.
  12. ↑ Ungarish, Marius (2006). "On gravity currents in a linearly stratified ambient: a generalization of Benjamin's steady-state propagation results". Journal of Fluid Mechanics. 548: 49–68. doi:10.1017/S0022112005007421.
  13. ↑ Ungarish, Marius; Hogg, Andrew J. (2018). "Models of internal jumps and the fronts of gravity currents: unifying two-layer theories and deriving new results". Journal of Fluid Mechanics. 846: 654–685. doi:10.1017/jfm.2018.219.
  14. ↑ Ungarish, Marius; Huppert, Herbert E. (2002). "On gravity currents propagating at the base of a stratified ambient". Journal of Fluid Mechanics. 458: 283–301. doi:10.1017/S0022112002007978.
  15. ↑ Birman, V. K.; Meiburg, E.; Ungarish, M. (2007). "On gravity currents in stratified ambients". Physics of Fluids. 19 (8): 086602. doi:10.1063/1.2756553.
  16. ↑ Ungarish, Marius (2025). "Box model for confined power-law viscous gravity currents including surface tension effects". Fluids. 10 (11): 279. doi:10.3390/fluids10110279.
  17. ↑ Ungarish, Marius (2026). "Down-slope propagation of a lock-release gravity current in a linearly stratified ambient fluid: shallow-water predictions and comparisons with previously published data". Journal of Fluid Mechanics. 1037: A65. doi:10.1017/jfm.2026.11743.
  18. ↑ Schneider, Wilhelm (1994). "Hydrodynamics of suspensions—fundamentals of centrifugal and gravity separation: M. Ungarish, Springer, Berlin (1993)". International Journal of Multiphase Flow. 20 (6): 1169. doi:10.1016/0301-9322(94)90061-2.
  19. ↑ Bark, Fritz H. (1995). "Hydrodynamics of Suspensions. By M. Ungarish. Springer, 1993". Journal of Fluid Mechanics. 290: 406–408. doi:10.1017/S0022112095212576.
  20. ↑ Flynn, M. R. (2010). "An Introduction to Gravity Currents and Intrusions. By M. Ungarish". Journal of Fluid Mechanics. 649: 537–539. doi:10.1017/S0022112009993326.
  21. ↑ Bonometti, Thomas (2011). "An Introduction to Gravity Currents and Intrusions, Ungarish, M. (2009). CRC Press, 489pp". International Journal of Multiphase Flow. 37 (9): 1254–1255. doi:10.1016/j.ijmultiphaseflow.2011.06.001.
  22. ↑ "Rothschild Fellows 1979–2018". Rothschild Fellows 2019 (PDF) (Report). Yad Hanadiv. 2019. p. 18. Retrieved 14 September 2026.
[edit]

Category:1951 births Category:Living people Category:Israeli mathematicians Category:Fluid dynamicists Category:Romanian emigrants to Israel Category:Technion – Israel Institute of Technology alumni

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