# Gregory P. Chini, Associate Professor

# Gregory P. Chini, Associate Professor

## Credentials

Prof. Greg Chini joined the Mechanical Engineering faculty at UNH in 1999. Since then, Prof. Chini has also worked as a visiting researcher in the Division of Applied and Computational Mathematics at the California Institute of Technology and in the Theoretical Mechanics Division of the School of Mathematical Sciences at Nottingham University (UK). He is a regular participant in the Annual Woods Hole Summer Program in Geophysical Fluid Dynamics.

Prof. Chini teaches undergraduate courses in Fluid Dynamics (ME 608) and Thermodynamics (ME 503) along with several advanced fluid dynamics and applied mathematics courses, including Waves in Fluids (ME 7/812), Viscous Flow (ME 909), and Asymptotic Methods (IAM 940). In 2007, Prof. Chini was appointed founding Co-Director of the CEPS Ph.D. Program in Integrated Applied Mathematics.

## Research Areas

Prof. Chini's research interests are in the allied fields of fluid dynamics and physical applied mathematics. His research involves the mathematical modeling of geophysical, environmental, biological and industrial flows. The existence and stability of coherent features (e.g. nonlinear waves, vortices, plumes, and boundary layers) in such flows are of particular interest. Using hybrid analytical-numerical techniques (e.g. asymptotic, variational, and spectral methods), he aims to develop simplified models of complex fluid-mechanical systems; these models are used for identifying key physical processes and for purposes of prediction, design, and control. His specific areas of interest include:

- Geophysical (especially Oceanographic), Environmental, Biological and Industrial Fluid Dynamics
- Mathematical Modeling, Asymptotic and Variational Analysis, Bifurcation Theory, Physical Applied Mathematics, Numerical Solution of PDEs
- Nonlinear Dynamics, Optimal Transport, and Mixing in Turbulent Convection and Boundary Layers
- Elasto-Capillary Phenomena in Biology and Soft Matter, Pulmonary Alveolar Mechanics.

For more information, please see the Integrated Applied Mathematics web page.

## Publications

- C. Beaume, E. Knobloch, G. P. Chini & K. Julien. Modulated patterns in a reduced model of a transitional shear flow. Accepted for publication in
*Physica**Scripta*(2015).

- A. Nassiri, G. P. Chini, A. Vivek, G. Daehn & B. Kinsey. Arbitrary Lagrangian–Eulerian finite element simulation and experimental investigation of wavy interfacial morphology during high velocity impact welding. Accepted for publication in
*Material & Design*(2015).

- B. Wen, G. P. Chini, R. R. Kerswell & C. Doering. Aspect-ratio-dependent upper bounds for two-dimensional Rayleigh–Benard convection between stress-free isothermal boundaries. Accepted for publication in
*Phys. Rev. E*(2015).

- C. Beaume, G. P. Chini, K. Julien & E. Knobloch. Reduced description of exact coherent states in parallel shear flows.
*Phys. Rev. E*(2015),**91**, 043010 (18pp).

- B. Wen, L. Corson & G. P. Chini. Structure and stability of steady porous medium convection at large Rayleigh number.
*Journal of Fluid Mechanics*(2015),**772**, pp. 197–224.

- Z. Zhang, G. P. Chini, K. Julien & E. Knobloch. Dynamic patterns in the reduced Craik– Leibovich equations.
*Physics of Fluids*(2015),**27**, 046605 (23pp).

- A. Nassiri, C. Campbell, G. P. Chini & B. Kinsey. Analytical model and experimental validation of single-turn, axi-symmetric coil for electromagnetic forming and welding. Accepted for publication in
*Pr**oc**ee**dings**of the North American Manufacturing Research Institution*(2015).

- C. Beaume, E. Knobloch, G. P. Chini & K. Julien. Exact coherent structures in an asymptoti- cally reduced description of parallel shear flows.
*Fluid Dynamics Research*(2015),**47**, 015504 (11pp).

- P. E. Hamlington, L. P. Van Roekel, B. Fox-Kemper, K. Julien & G. Chini. Langmuir– submesoscale interactions: Descriptive analysis of multiscale frontal spindown simulations.
*Journal of Physical Oceanography*(2014),**44**, 2249–2272.

- P. Hassanzadeh, G. P. Chini & C. R. Doering. Wall to wall optimal transport.
*Journal of Fluid**Mechanics***751**, pp. 627–662.

- G. P. Chini, Z. Malecha & T. D. Dreeben. Large-amplitude acoustic streaming.
*Journal of Fluid**Mechanics***744**, pp. 329–351.

- A. Nassiri, G. P. Chini & B. Kinsey. Spatial stability analysis of emergent wavy interfacial pat- terns in magnetic pulsed welding.
*CIRP Annals – Manufacturing Technology*(2014),**63**, pp. 245–248.

- Z. Malecha, G. P. Chini & K. Julien. A multiscale algorithm for simulating spatially-extended Langmuir circulation dynamics.
*Journal of Computational Physics*(2014),**271**, pp. 131–150.

- B. Wen, G. P. Chini, N. Dianati & C. Doering. Computational approaches to aspect-ratio- dependent upper bounds and heat flux in porous medium convection.
*Physics Letters A*(2012),**377**, pp. 2931–2938.

- K. Li, G. P. Chini, Z. Zhang & G. Flierl. Langmuir circulation: An agent for vertical
*re*stratification?*Journal of Physical Oceanography*(2012)**42**, pp. 1945–1958.

- B. Wen, N. Dianati, E. Lunasin, G. P. Chini & C. Doering. New upper bounds and reduced dynamical modeling for Rayleigh–B´enard convection in a fluid-saturated porous layer.
*Communications in**Nonlinear**Science**and Numerical Simulations*(2012) 17, pp. 21912199.

- T. D. Dreeben & G. P. Chini. Two-dimensional streaming flows in high-intensity discharge lamps
*†*.*Physics of Fluids*(2011)**23**, pp. 056101.*†*AIP Physics of Fluids "Research Highlight," June 2011.

- G. P. Chini, N. Dianati, Z. Zhang & C. R. Doering. Low-dimensional models from upper bound theory.
*Physica**D*(2011)**240**, pp. 241–248.

- G. P. Chini & S. M. Cox. Large Rayleigh number thermal convection: Heat-flux predictions and strongly nonlinear solutions.
*Physics of Fluids*(2009)**21**, pp. 083603.

- G. P. Chini, K. Julien & E. Knobloch. An asymptotically reduced model of turbulent Langmuir circulation.
*Geophysical**& Astrophysical Fluid Dynamics*(2009)**103:2**, pp. 179–197.

- G. P. Chini. Strongly nonlinear Langmuir circulation and Rayleigh–B´enard convection.
*Journal of Fluid Mechanics*(2008)**614**, pp. 39–65.

- G. P. Chini & S. Leibovich. Resonant Langmuir circulation–internal wave interaction. Part 2. Langmuir circulation instability.
*Journal of Fluid Mechanics*(2005)**524**, pp. 99–120.

- O. E. Jensen, G. P. Chini & J. R. King. Thin-film flows near isolated humps and interior corners.
*Journal of Engineering Mathematics*(2004)**50**, pp. 289-309.

- G. P. Chini & S. Leibovich. Resonant Langmuir circulation–internal wave interaction. Part 1. Internal wave reflection.
*Journal of Fluid Mechanics*(2003)**495**, pp. 35–55.

- G. P. Chini & S. Leibovich. An analysis of the Klemp & Durran radiation boundary condition as applied to dissipative internal waves.
*Journal of Physical Oceanography*(2003)**33**, pp. 2394–2407.

- E. A. Thornton, D. W. Gulick & G. P. Chini. Thermally-induced vibrations of a self-shadowed split-blank solar array.
*Journal of Spacecraft and Rockets*(1995)**32**, pp. 302–311.