Explanipedia

Vortex topology in the lee of a 6:1 prolate spheroid Open

Marc Plasseraud, Krishnan Mahesh · 2025

A large scale parametric study of the flow over the prolate spheroid is presented to understand the effect of Reynolds number and angle of attack on the separation, the wake formation and the loads. Large-Eddy Simulation is performed for s…

Large-eddy simulation of a non-equilibrium turbulent boundary layer Open

Praveen Kumar, Krishnan Mahesh · 2025

Wall-resolved large-eddy simulation (LES) of a non-equilibrium turbulent boundary layer (TBL) is performed. The simulations are based on the experiments of Volino (2020 a J. Fluid Mech. 897 , A2), who reported profile measurements at sever…

Large-eddy simulation of the tip vortex flow in a ducted propulsor Open

Theo J. T. Leasca, Thomas Kroll, Krishnan Mahesh · 2025

Large-eddy simulation (LES) is performed to study the tip vortex flow in a ducted propulsor geometry replicating the experiments of Chesnakas & Jessup (2003, pp. 257–267), Oweis et al. (2006 a J. Fluids Engng 128 , 751–764) and Oweis et al…

A large-eddy simulation study of water tunnel interference effects for a marine propeller in crashback mode of operation Open

Thomas Kroll, Krishnan Mahesh · 2025

Marine propellers are studied in design and off-design modes of operation like crashback, where the propeller rotates in reverse while the vehicle is in forward motion. Past experiments (Jessup et al. , Proceedings of the 25th Symposium on…

A Non‐Dissipative, Energy‐Conserving, Arbitrary High‐Order Numerical Method and Its Efficient Implementation for Incompressible Flow Simulation in Complex Geometries Open

Sreevatsa Anantharamu, Krishnan Mahesh · 2024

In the inviscid limit, the energy of a velocity field satisfying the incompressible Navier–Stokes equations is conserved. Non‐dissipative numerical methods that discretely mimic this energy conservation feature have been demonstrated in th…

Definition of vortex boundary using stagnation pressure Open

Marc Plasseraud, Krishnan Mahesh · 2024

A novel method is proposed to identify vortex boundary and center of rotation based on tubular surfaces of constant stagnation pressure and minimum of the stagnation pressure gradient. The method is derived from Crocco's theorem, which ens…

Effect of gas content on cavitation nuclei Open

Karim Alamé, Krishnan Mahesh · 2024

Cavitation inception originates from nuclei in a liquid. This paper proposes a Gibbs free energy approach that provides a smooth transition from homogeneous to heterogeneous nucleation when gas is present. The impact of gas content on nucl…

Boundary layer transition due to distributed roughness: effect of roughness spacing Open

Rong Ma, Krishnan Mahesh · 2023

The influence of roughness spacing on boundary layer transition over distributed roughness elements is studied using direct numerical simulation and global stability analysis, and compared with isolated roughness elements at the same Reyno…

Large-scale molecular dynamics simulations of bubble collapse in water: Effects of system size, water model, and nitrogen Open

Jingyi L. Chen, Jesse L. Prelesnik, Buyun Liang, Yangzesheng Sun, Mrugank Bhatt , et al. · 2023

Molecular dynamics simulations in the microcanonical ensemble are performed to study the collapse of a bubble in liquid water using the single-site mW and the four-site TIP4P/2005 water models. To study system size effects, simulations for…

Direct numerical simulation-based vibroacoustic response of plates excited by turbulent wall-pressure fluctuations Open

Soham Prajapati, Sreevatsa Anantharamu, Krishnan Mahesh · 2023

We use direct numerical simulation to study the vibroacoustic response of an elastic plate in a turbulent channel at $Re_\tau$ of 180 and 400 for three plate boundary conditions and two materials – synthetic rubber and stainless steel. The…

Tripping effects on model-scale studies of flow over the DARPA SUBOFF Open

Nicholas Morse, Krishnan Mahesh · 2023

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 …

A compressible multi-scale model to simulate cavitating flows Open

Aditya Madabhushi, Krishnan Mahesh · 2023

We propose a compressible multi-scale model that (i) captures the dynamics of both large vapour cavities (resolved vapour) and micro-bubbles (unresolved vapour), and (ii) accounts for medium compressibility. The vapour mass, momentum and e…

Large-eddy simulation of tripping effects on the flow over a 6 : 1 prolate spheroid at angle of attack Open

Marc Plasseraud, Praveen Kumar, Krishnan Mahesh · 2023

Large-eddy simulation is used to simulate the flow around a 6 : 1 prolate spheroid at $10^\circ$ and $20^\circ$ angles of attack, and Reynolds number $4.2 \times 10^6$ . Flows with and without trip are compared to understand the relative e…

Boundary layer transition due to distributed roughness: Effect of roughness spacing Open

Rong Ma, Krishnan Mahesh · 2023

The influence of roughness spacing on boundary layer transition over distributed roughness elements is studied using direct numerical simulation (DNS) and global stability analysis, and compared to isolated roughness elements at the same R…

Effect of tabs on the shear layer dynamics of a jet in cross-flow Open

Nicholas Morse, Krishnan Mahesh · 2023

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 veloci…

A variational volume-of-fluid approach for front propagation Open

Ali Fakhreddine, Karim Alamé, Krishnan Mahesh · 2023

A variational volume-of-fluid (VVOF) methodology is devised for evolving interfaces under curvature-dependent speed. The interface is reconstructed geometrically using the analytic relations of Scardovelli and Zaleski [1] and the advection…

Global stability analysis and direct numerical simulation of boundary layers with an isolated roughness element Open

Rong Ma, Krishnan Mahesh · 2022

Global stability analysis and direct numerical simulation (DNS) are used to study boundary layer flows with an isolated roughness element. The aspect ratio of the element ( $\eta$ ) is small, while the ratio of element height to displaceme…

Arnoldi-based orthonormal and hierarchical divergence-free polynomial basis and its applications Open

Sreevatsa Anantharamu, Krishnan Mahesh · 2022

This paper presents a methodology to construct a divergence-free polynomial basis of an arbitrary degree in a simplex (triangles in 2D and tetrahedra in 3D) of arbitrary dimension. It allows for fast computation of all numerical solutions …

Large-eddy simulation of a ducted propeller in crashback Open

Thomas Kroll, Krishnan Mahesh · 2022

Large-eddy simulation (LES) using an unstructured overset numerical method is performed to study the flow around a ducted marine propeller for the highly unsteady off-design condition called crashback. Known as one of the most challenging …

A method to determine wall shear stress from mean profiles in turbulent boundary layers Open

Praveen Kumar, Krishnan Mahesh · 2021

Large-eddy simulation of cavitation inception in a shear flow Open

Filipe Brandao, Krishnan Mahesh · 2021

We present a numerical study of inception in the shear layer of a backward-facing step under the same conditions as experiments (Agarwal et al., 2018). The velocity field is shown to be in good agreement with experiments. Since inception i…

Large-eddy simulation and streamline coordinate analysis of flow over an axisymmetric hull Open

Nicholas Morse, Krishnan Mahesh · 2021

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…

Response of a plate in turbulent channel flow: Analysis of fluid–solid coupling Open

Sreevatsa Anantharamu, Krishnan Mahesh · 2020

Improving Endurance of A Glider by using Solar Cells Open

Bassetti Chandrasheker, Krishnan Mahesh · 2020

The main aim of this paper is to improve the endurance of a glider using solar cells.For this, a glider is initially modeled and analyzed which was later built and fabricated, a prototype of its kind.According to the area of a wing of the …

A Case Study on Thermal Efficiency Analysis of Hybrid Steam Condenser with Corrugated tubes in Thermal Power Plant Open

Krishnan Mahesh, Lasheer Shareef Mohammad, Krishna Mylapalli · 2020

A Case Study on Thermal Efficiency Analysis of Hybrid Steam Condenser with Corrugated tubes in Thermal Power Plant - written by Mahesh K , Lasheer Shareef Mohammad , Krishna Mylapalli published on 2020/02/07 download full article with refe…

A variational level set methodology without reinitialization for the prediction of equilibrium interfaces over arbitrary solid surfaces Open

Karim Alamé, Sreevatsa Anantharamu, Krishnan Mahesh · 2019

Direct numerical simulation of turbulent channel flow over random rough surfaces Open

Rong Ma, Karim Alamé, Krishnan Mahesh · 2019

Direct numerical simulation (DNS) of flow in a turbulent channel with a random rough wall is performed at $Re_τ=400$ and $600$. The roughness geometry corresponds to the experiments of Flack and Schultz (personal communication). The rough …

A massively-parallel, unstructured overset method to simulate moving bodies in turbulent flows Open

Wyatt Horne, Krishnan Mahesh · 2019

Multiphase unsteady Stokes flow over grooved surfaces: an analytical study Open

Yixuan Li, Karim Alamé, Krishnan Mahesh · 2019

This paper studies multiphase flow within grooved textures exposed to external unsteadiness. We derive analytical expressions for multiphase unsteady Stokes flow driven by oscillating streamwise/spanwise velocity in the presence of periodi…

A parallel and streaming Dynamic Mode Decomposition algorithm with finite precision error analysis for large data Open

Sreevatsa Anantharamu, Krishnan Mahesh · 2019

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