Journal Articles

1. N. R. Rapaka & M. K. Riahi (2025)

Generalized Fourier Series: An O(N log2(N)) extension for aperiodic functions that eliminates Gibbs oscillations

(under review)

2. N. R. Rapaka & R. Samtaney (2020)

An efficient Poisson solver for complex embedded boundary domains using the multi-grid and fast multipole methods

Journal of Computational Physics (410: 109387) [DOI] [PDF, Pre-proof]

3. N. R. Rapaka & R. Samtaney (2018)

Non-normal stability of embedded boundary methods through pseudospectra

Journal of Computational Physics (373: 975-999) [DOI] [PDF]

4. N. R. Rapaka & S. Sarkar (2016)

An immersed boundary method for direct and large eddy simulation of stratified flows in complex geometry

Journal of Computational Physics (322: 511-534) [DOI] 

5. M. B. de Stadler, N. R. Rapaka & S. Sarkar (2014)

Large eddy simulation of the near to intermediate wake of a heated sphere at Re=10,000

Int. J. Heat and Fluid Flow (49: 2-10) [PDF]

6. M. B. Jalali, N. R. Rapaka, & S. Sarkar (2014)

Tidal flow over topography: effect of excursion number on wave energetics and turbulence

Journal of Fluid Mechanics (750: 259-283) [PDF]

7. N. R. Rapaka, B. Gayen & S. Sarkar (2013)

Tidal conversion and turbulence at a model ridge: direct and large eddy simulations 

Journal of Fluid Mechanics (715: 181-209) [PDF]

Thesis / Dissertation

1. Narsimha Reddy Rapaka (2015)

Simulation of stratified turbulent flows in complex geometry

Ph.D Dissertation, University of California San Diego, La Jolla, CA, USA. [PDF] [LINK]

2. Narsimha Reddy Rapaka (2006)

Implementation of eddy-viscosity turbulence models in a general-purpose CFD solver

M.Tech Thesis, Indian Institute of Technology Kanpur, UP, India. [PDF]

Technical Reports

1. S. Rahul, N. R. Rapaka & V. Eswaran (2008)

DAE-IITK general purpose CFD solver - Tutorial and user manual

Indian Institute of Technology Kanpur, UP, India. [LINK] [PDF]

Conference Presentations

1. N. R. Rapaka & R. Samtaney (2021)

A novel adaptive spectral method for fluid flow simulations in non-periodic domains

74th Annual Meeting of the American Physical Society - Division of Fluid Dynamics, Phoenix, AZ.

2. N. R. Rapaka & R. Samtaney (2017)

A pseudospectra-based approach to non-normal stability of embedded boundary methods

70th Annual Meeting of the American Physical Society - Division of Fluid Dynamics, Denver, CO.

3. N. R. Rapaka, M. Al Marouf, & R. Samtaney (2016)

Efficient ghost cell reconstruction for embedded boundary methods

69th Annual Meeting of the American Physical Society - Division of Fluid Dynamics, Portland, OR.

4. M. Al Marouf, N. R. Rapaka & R. Samtaney (2016)

An embedded-boundary AMR method for compressible flow in moving complex geometry

28th International Conference on Parallel Computational Fluid Dynamics, Kobe, Japan.

5. N. R. Rapaka & S. Sarkar (2014)

An immersed boundary method for the simulation of turbulent stratified flows over rough topography

67th Annual Meeting of the American Physical Society - Division of Fluid Dynamics, San Francisco, CA.

6. N. R. Rapaka & S. Sarkar (2013)

Large overturns at a model Luzon Strait topography: an application of the Immersed Boundary Method

66th Annual Meeting of the American Physical Society - Division of Fluid Dynamics, Pittsburgh, PA.

7. N. R. Rapaka, B. Gayen & S. Sarkar (2012)

Effect of slope criticality and tidal forcing on internal tide energetics at a model ridge

65th Annual Meeting of the American Physical Society - Division of Fluid Dynamics, San Diego, CA.

8. N. R. Rapaka, B. Gayen & S. Sarkar (2012)

Direct and large eddy simulations of internal tides at a model ridge

6th Southern California Symposium on Flow Physics, Santa Barbara, CA.

9. N. R. Rapaka, B. Gayen & S. Sarkar (2011)

Numerical simulations of internal tides at a model ridge

64th Annual Meeting of the American Physical Society - Division of Fluid Dynamics, Baltimore, MD.

10. N. R. Rapaka, B. Gayen & S. Sarkar (2011)

Tidal energy conversion at oceanic ridges

5th Southern California Symposium on Flow Physics, Los Angeles, CA.

11. N. R. Rapaka & S. Sarkar (2010)

Application of immersed boundary method to DNS of stratified flows

63rd Annual Meeting of the American Physical Society - Division of Fluid Dynamics, Long Beach, CA.

Posters

1. N. R. Rapaka & R. Samtaney (2017)

Non-normal stability of embedded boundary methods through pseudospectra

KAUST Research Conference - Predictive Complex Computational Fluid Dynamics, Thuwal, KSA, 22-24 May 2017.

2. N. R. Rapaka, B. Gayen & S. Sarkar (2011)

Tidal energy conversion at model oceanic ridges

30th Annual Research Expo - UCSD Jacobs School of Engineering, La Jolla, CA.