Publications
Journal Papers | Conference Papers | Conference Abstracts | Thesis
Journal Papers
International Journal of Multiphase Flow, 2025
Nicholas Morse The statistics of sub-Kolmogorov-scale droplet breakup are investigated at a higher Taylor Reynolds number ($Re_{\lambda_T}$) than similar work at low $Re_{\lambda_T}$ (Cristini et al., 2003) to elucidate intermittency and neck pinch off behaviors. To this end, a boundary element method (BEM) is developed to enable simulations of the stochastic Stokes… Read more
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Journal of Fluid Mechanics, 2023
Nicholas Morse, Krishnan Mahesh Trip-resolved large-eddy simulations of the DARPA SUBOFF are performed to investigate the development of turbulent boundary layers (TBLs) in model-scale studies. The primary consideration of the study is the extent to which the details of tripping affect statistics in large-eddy simulations of complex geometries, which are presently limited to moderate… Read more
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Journal of Fluid Mechanics, 2023
Nicholas Morse, Krishnan Mahesh Direct numerical simulations (DNS) of a jet in cross-flow (JICF) with a triangular tab at two positions are performed at jet-to-cross-flow velocity ratios of $R = 2$ and $4$ with a jet Reynolds number of 2000 based on the jet’s bulk velocity and exit diameter. The DNS and dynamic mode… Read more
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Journal of Fluid Mechanics, 2021
Nicholas Morse, Krishnan Mahesh A new perspective on the analysis of turbulent boundary layers on streamlined bodies is provided by deriving the axisymmetric Reynolds-averaged Navier–Stokes equations in an orthogonal coordinate system aligned with streamlines, streamline-normal lines and the plane of symmetry. Wall-resolved large-eddy simulation using an unstructured overset method is performed to study flow… Read more
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Conference Papers
14th International Symposium on Turbulence and Shear Flow Phenomena (TSFP14), 2026
Nicholas Morse, Ronith Stanly, Ramis Örlü, Philipp Schlatter We perform direct numerical simulations (DNS) of the flow over the Boeing Gaussian bump in two configurations: the straight-ahead flow considered in published DNS, and in a $45^\circ$ swept configuration, at the same bump Reynolds number of $Re_L = 1$ million. In the baseline (unswept) configuration, we analyze the flow… Read more
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14th International Symposium on Turbulence and Shear Flow Phenomena (TSFP14), 2026
Nicholas Morse, Mathis Bode, Niclas Jansson, R.J. Lingwood, Mihai Mihaescu, P. Henrik Alfredsson, Ramis Örlü, Philipp Schlatter The von Kármán turbulent boundary layer (vKTBL) induced by a rotating disk is a canonical three-dimensional turbulent boundary layer (3DTBL) that develops without a 2D precursor and exhibits unique structural features, including discrepancies between momentum and heat transfer. We present direct numerical simulations (DNS) of the vKTBL up to an… Read more
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15th ERCOFTAC Workshop on Direct and Large Eddy Simulation (DLES15), 2026
Nicholas Morse, Mathis Bode, Niclas Jansson, Mihai Mihaescu, Ramis Örlü, Philipp Schlatter The von Kármán turbulent boundary layer (vKTBL) is a valuable example of a canonical 3DTBL, with several properties making it worthy of study. By leveraging modern hardware accelerators, we perform a DNS of the vKTBL at a higher resolution and with a more expansive domain than considered in the existing… Read more
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AIAA SciTech Forum, 2023
Michael Fenelon, Yang Zhang, Louis Cattafesta III, Nick Morse, Krishnan Mahesh, Lanyu Li, Zhao Pan Particle Tracking Velocimetry (PTV) is a non-intrusive measurement technique that is gaining increasing popularity in the experimental fluid mechanics community. The basic working principle is to determine three-dimensional Lagrangian particle tracks via multiple exposures separated by known time intervals as seen by at least three cameras. The practical extension of… Read more
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34th Symposium on Naval Hydrodynamics, 2022
Nicholas Morse, Thomas Kroll, Krishnan Mahesh Large-eddy simulation (LES) using an unstructured overset grid method (Horne and Mahesh, 2019) is used to explore several building-block problems of interest for submerged marine vehicles, including the bare and appended DARPA SUBOFF and the open and ducted propeller David Taylor Model Basin (DTMB) 4381 in crashback. An emphasis is… Read more
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33rd Symposium on Naval Hydrodynamics, 2020
Thomas Kroll, Nicholas Morse, Wyatt Horne, Krishnan Mahesh Large-eddy simulation (LES) using an unstructured overset grid method (Horne and Mahesh, 2019) is used to explore several building-block problems of interest for submerged marine vehicles, including the bare and appended DARPA SUBOFF and the open and ducted propeller David Taylor Model Basin (DTMB) 4381 in crashback. An emphasis is… Read more
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Conference Abstracts
AIChE Annual Meeting, 2024
Nicholas Morse, Johan Remmelgas, Johannes Khinast Nanoparticles have shown great promise as a pharmaceutical carrier, evidenced most strongly by the success of lipid nanoparticles as carriers for mRNA vaccines during the COVID-19 pandemic. However, the fundamental processes that govern nanoparticle formation are still not well understood and particle size predictions are generally reliant on empiricism. Numerical… Read more
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75th Annual Meeting of the APS Division of Fluid Dynamics, 2022
Nicholas Morse, Krishnan Mahesh Passive devices such as tabs have been shown to be an effective method of altering the characteristics of regular and transverse jets, although the specifics of how tabs affect jet flow fields are not well understood, especially for jets in crossflow. Direct numerical simulations of a tabbed jet in crossflow… Read more
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75th Annual Meeting of the APS Division of Fluid Dynamics, 2022
Michael Fenelon, Louis Cattafesta III, Yang Zhang, Krishnan Mahesh, Nick Morse Multi-pulse tracking velocimetry is gaining increasing popularity in the fluid mechanics community. The basic working principle is to trace the particle displacements in multiple images separated by specified time intervals, and then the Lagrangian particle path and associated quantities can be determined. A recent breakthrough in particle tracking velocimetry was… Read more
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74th Annual Meeting of the APS Division of Fluid Dynamics, 2021
Nicholas Morse, Krishnan Mahesh Turbulent boundary layers with streamline curvature are ubiquitous in engineering applications, and the flow around axisymmetric bodies is further complicated by transverse curvature. We analyze results of wall-resolved large-eddy simulation of an axisymmetric hull in an orthogonal coordinate system defined by streamlines and streamline-normal lines. The numerical algorithm used in… Read more
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73rd Annual Meeting of the APS Division of Fluid Dynamics, 2020
Nicholas Morse, Krishnan Mahesh Appended axisymmetric bodies are of particular interest in marine vehicle applications, in which the wakes and horseshoe vortices of the appendages are ingested by the propulsor. We discuss the application of a novel unstructured overset method to wall-resolved large-eddy simulation (LES) of an appended hull geometry. The numerical algorithm used… Read more
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72nd Annual Meeting of the APS Division of Fluid Dynamics, 2019
Nicholas Morse, Wyatt Horne, Krishnan Mahesh We discuss the development of large-eddy simulation (LES) capability towards the simulation of maneuvering vehicles using the novel unstructured overset numerical algorithm developed by Horne and Mahesh [J. Comput. Phys (2019) 376:585-596]. This method addresses the discrete conservation and scaling challenges of overset methodologies and allows for simulation of flows… Read more
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70th Annual Meeting of the APS Division of Fluid Dynamics, 2017
Diogo Barros, Yi Hui Tee, Nicholas Morse, Ben Hiltbrand, Ellen Longmire Entrainment and suspension of particles within turbulent flows occur widely in environmental and industrial processes. Three-dimensional particle tracking experiments are thus conducted in a water channel to understand the interaction of finite-size particles with a turbulent boundary layer. A neutrally buoyant sphere made of wax and iron oxide is first… Read more
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Thesis
University of Minnesota, 2023
Nicholas Morse The goal of this dissertation is to provide insight into the underlying physics of two sets of complex flows: (i) the axisymmetric and appended DARPA SUBOFF and (ii) tabbed jets in crossflow. The accurate simulation of the flow around marine vessels such as the DARPA SUBOFF is critical for maneuvering… Read more
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