Ali Mani
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View article: Computation of Different sectors of Water Demand in the Guntur Channel Command Area, Andhra Pradesh, India (2010-17)
Computation of Different sectors of Water Demand in the Guntur Channel Command Area, Andhra Pradesh, India (2010-17) Open
Water is a critical resource for development of other resources. The assessment of available water resources and demand of water for various purposes is of utmost important without which it is difficult to prepare any developmental plan. G…
View article: Atwood effects on nonlocality of the scalar transport closure in three-dimensional Rayleigh-Taylor mixing
Atwood effects on nonlocality of the scalar transport closure in three-dimensional Rayleigh-Taylor mixing Open
The importance of nonlocality is assessed in modeling mean scalar transport for turbulent Rayleigh-Taylor (RT) mixing at different Atwood numbers. Building on the two-dimensional incompressible work of Lavacot et al. (2024, JFM), the prese…
View article: Confinement of Organic Molecules in Microporous Electrodes for Enhanced Energy Storage
Confinement of Organic Molecules in Microporous Electrodes for Enhanced Energy Storage Open
Microporous electrodes (pores < 2 nm in width) can confine molecules into uniquely packed, charged volumes that exhibit characteristics different from molecules from a bulk solution interacting with an electrode surface. By using surface a…
View article: A mass-conserving contact line treatment for second-order conservative phase field methods based on the generalized Navier boundary condition
A mass-conserving contact line treatment for second-order conservative phase field methods based on the generalized Navier boundary condition Open
A mass-conserving contact line treatment for second-order conservative phase field methods is presented and applied to the conservative diffuse interface (CDI) model. The treatment centers on a no-flux boundary condition for the phase fiel…
View article: Diffuse interface treatment in generalized curvilinear coordinates with grid-adapting interface thickness
Diffuse interface treatment in generalized curvilinear coordinates with grid-adapting interface thickness Open
A general approach for transforming phase field equations into generalized curvilinear coordinates is proposed in this work. The proposed transformation can be applied to isotropic, non-isotropic, and curvilinear grids without adding any a…
View article: Direct calculation of the eddy viscosity operator in turbulent channel flow at <i>Re</i><sub> <i>τ</i> </sub> = 180
Direct calculation of the eddy viscosity operator in turbulent channel flow at <i>Re</i><sub> <i>τ</i> </sub> = 180 Open
This study aims to quantify how turbulence in a channel flow mixes momentum in the mean sense. We applied the macroscopic forcing method (Mani & Park, Phys. Rev. Fluids , 2021, 054607) to direct numerical simulation (DNS) of a turbulent ch…
View article: Nonlocality of the slip length operator for scalar and momentum transport in turbulent flow over superhydrophobic surfaces
Nonlocality of the slip length operator for scalar and momentum transport in turbulent flow over superhydrophobic surfaces Open
Superhydrophobic surfaces (SHS) are textured hydrophobic surfaces which have the ability to trap air pockets when immersed in water. This can result in significant drag reduction, due to substantially lower viscosity of air resulting in su…
View article: Reynolds stress decay modeling informed by anisotropically forced homogeneous turbulence
Reynolds stress decay modeling informed by anisotropically forced homogeneous turbulence Open
Models for solving the Reynolds-averaged Navier-Stokes equations are popular tools for predicting complex turbulent flows due to their computational affordability and ability to provide or estimate quantities of engineering interest. Howev…
View article: A model for drift velocity mediated scalar eddy diffusivity in homogeneous turbulent flows
A model for drift velocity mediated scalar eddy diffusivity in homogeneous turbulent flows Open
Low Stokes number particles at dilute concentrations in turbulent flows can reasonably be approximated as passive scalars. The added presence of a drift velocity due to buoyancy or gravity when considering the transport of such passive sca…
View article: Non-locality of mean scalar transport in two-dimensional Rayleigh–Taylor instability using the macroscopic forcing method
Non-locality of mean scalar transport in two-dimensional Rayleigh–Taylor instability using the macroscopic forcing method Open
The importance of non-locality of mean scalar transport in two-dimensional Rayleigh–Taylor Instability (RTI) is investigated. The macroscopic forcing method is utilized to measure spatio-temporal moments of the eddy diffusivity kernel repr…
View article: Measurement of an eddy diffusivity for chaotic electroconvection using combined computational and experimental techniques
Measurement of an eddy diffusivity for chaotic electroconvection using combined computational and experimental techniques Open
The Poisson-Nernst-Planck-Stokes equations capture the chaotic dynamics of electroconvection accurately, but direct numerical simulation of electroconvection is prohibitively expensive. Furthermore, prediction of the mean fields via applic…
View article: Carbonate Management to Enable Energy- and Carbon-Efficient CO<sub>2</sub> Electrolysis (Final Technical Report)
Carbonate Management to Enable Energy- and Carbon-Efficient CO<sub>2</sub> Electrolysis (Final Technical Report) Open
The rapid growth and plummeting cost of solar energy have spurred growing interest in using CO2 electrolysis to produce chemicals and fuels as an alternative to conventional petrochemical processes. High-temperature (>800 °C) solid oxide e…
View article: A disposable reader-sensor solution for wireless temperature logging
A disposable reader-sensor solution for wireless temperature logging Open
Wireless passive sensors, being battery-free and simple, are suitable for disposable use across various applications, from tracking food and monitoring the environment to clinical diagnostics. However, their utilization is hampered by the …
View article: A model for drift velocity mediated scalar eddy diffusivity in homogeneous turbulent flows
A model for drift velocity mediated scalar eddy diffusivity in homogeneous turbulent flows Open
Low Stokes number particles at dilute concentrations in turbulent flows can reasonably be approximated as passive scalars. The added presence of a drift velocity due to buoyancy or gravity when considering the transport of such passive sca…
View article: Targeted computation of nonlocal closure operators via an adjoint-based macroscopic forcing method
Targeted computation of nonlocal closure operators via an adjoint-based macroscopic forcing method Open
Reynolds-averaged Navier--Stokes (RANS) closure must be sensitive to the flow physics, including nonlocality and anisotropy of the effective eddy viscosity. Recent approaches used forced direct numerical simulations to probe these effects,…
View article: Nonlocality of Mean Scalar Transport in Two-Dimensional Rayleigh-Taylor Instability Using the Macroscopic Forcing Method
Nonlocality of Mean Scalar Transport in Two-Dimensional Rayleigh-Taylor Instability Using the Macroscopic Forcing Method Open
The importance of nonlocality of mean scalar transport in 2D Rayleigh-Taylor Instability (RTI) is investigated. The Macroscopic Forcing Method (MFM) is utilized to measure spatio-temporal moments of the eddy diffusivity kernel representing…
View article: Fast Macroscopic Forcing Method
Fast Macroscopic Forcing Method Open
The macroscopic forcing method (MFM) of Mani and Park and similar methods for obtaining turbulence closure operators, such as the Green's function-based approach of Hamba, recover reduced solution operators from repeated direct numerical s…
View article: Inverse asymptotic treatment: capturing discontinuities in fluid flows via equation modification
Inverse asymptotic treatment: capturing discontinuities in fluid flows via equation modification Open
A major challenge in developing accurate and robust numerical solutions to multi-physics problems is to correctly model evolving discontinuities in field quantities, which manifest themselves as interfaces between different phases in multi…
View article: Direct numerical simulation of electrokinetic transport phenomena in fluids: variational multi-scale stabilization and octree-based mesh refinement
Direct numerical simulation of electrokinetic transport phenomena in fluids: variational multi-scale stabilization and octree-based mesh refinement Open
Computational modeling of charged species transport has enabled the analysis, design, and optimization of a diverse array of electrochemical and electrokinetic devices. These systems are represented by the Poisson-Nernst-Planck (PNP) equat…
View article: Closures for multicomponent reacting flows based on dispersion analysis
Closures for multicomponent reacting flows based on dispersion analysis Open
This work presents algebraic closure models associated with advective transport and nonlinear reactions in a Reynolds-averaged Navier-Stokes context for a system of species subject to binary reactions and transport by advection and diffusi…