Sitemap
A list of all the posts and pages found on the site. For you robots out there is an XML version available for digesting as well.
Pages
Posts
Future Blog Post
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Blog Post number 4
Published:
This is a sample blog post. Lorem ipsum I can’t remember the rest of lorem ipsum and don’t have an internet connection right now. Testing testing testing this blog post. Blog posts are cool.
Blog Post number 3
Published:
This is a sample blog post. Lorem ipsum I can’t remember the rest of lorem ipsum and don’t have an internet connection right now. Testing testing testing this blog post. Blog posts are cool.
Blog Post number 2
Published:
This is a sample blog post. Lorem ipsum I can’t remember the rest of lorem ipsum and don’t have an internet connection right now. Testing testing testing this blog post. Blog posts are cool.
Blog Post number 1
Published:
This is a sample blog post. Lorem ipsum I can’t remember the rest of lorem ipsum and don’t have an internet connection right now. Testing testing testing this blog post. Blog posts are cool.
portfolio
Computational Modelling of DBD Actuators and Electrodynamic Analysis
Simulating and modeling DBD actuators.
Turbulence in Compressible Systems and Energy Transfer Across Scales
Analyzing scale dynamics in compressible turbulence for my PhD research.
Topological Data Analysis of Dark Matter Density Field
Investigating the cosmic web’s structure through topological data analysis.
publications
Numerical modeling of dielectric barrier discharge actuators based on the properties of low-frequency plasmons
Published in Scientific Reports, 2022
This work develops a new model for the simulation of plasma actuators and demonstrates the abilities of the model.
Recommended citation: Tehrani, D.S., Abdizadeh, G.R. & Noori, S. Numerical modeling of dielectric barrier discharge actuators based on the properties of low-frequency plasmons. Sci Rep 12, 10378 (2022). https://www.nature.com/articles/s41598-022-14370-z
On Galilean invariance of mean kinetic helicity
Published in Physics of Fluids, 2023
This paper provides a neat proof on the Galilean Invariance of the mean kinetic helicity.
Recommended citation: Soltani Tehrani, D., & Aluie, H. (2023). On Galilean invariance of mean kinetic helicity. Physics of Fluids, 35(12). https://doi.org/10.1063/5.0178926
talks
Numerical modeling of dielectric barrier discharge actuators based on the properties of low-frequency plasmons
Published:
Electrohydrodynamic flow control systems have proven to be among the most promising flow control strategies within previous decades. Several methods are available for efficient evaluation and description of such systems’ effects. Yet, due to these systems’ critical role in various applications, possible improvements are still being investigated. A new phenomenological model is presented for the simulation of the plasma actuators based on the electrodynamic properties of low-frequency plasmons. The model simulates the plasmonic region as a dispersive medium. This dissipated energy is added to the flow by introducing a high-pressure region, calculated in terms of local body force vectors, requiring the distribution of the electric field and the polarization field. The model determines the electric field for the computation of the body force vector based on the Poisson equation and implements the simplified Lorentz model for the polarization field. To fully explore the performance of the presented model, an experiment has been conducted, comparing the observed effect of plasma actuators on the fluid flow with the results predicted by the model. The model is then validated based on the results of other distinct experiments and exempted numerical models based on the exchanging momentum with the ambient neutrally charged fluid, demonstrating that the model has improved adaptability and self-adjusting capability compared to the available models.
Energy transfer across scales in a shock: is it a scale-local cascade?
Published:
It is commonly claimed that kinetic energy (KE) in the presence of a shock does not undergo an inertial scale-local cascade but that KE at a given scale must be dissipated directly into heat at the viscous (molecular) scales without passing through intermediate scales. Using rigorous mathematical analysis and physical arguments, we will explain why this widely held notion rests on flawed/unrefined intuition. We demonstrate rigorous proofs of scale-locality of the cascade due to shocks using two examples:(i) Burgers equation and (ii) exact 1D normal shock solution. Our analytical results hold in broad generality, for turbulence at any Mach number, for any equation of state, and without the requirement of homogeneity or isotropy. The assumptions we make in our proofs on the scaling of velocity, pressure, and density structure functions are weak and enjoy compelling empirical support.
Scale-Locality: Insights into the energy cascade across scales in a shock
Published:
Inter-scale energy transfer (or the cascade) is of relevance to both LES modeling and turbulence theory. In incompressible homogeneous isotropic turbulence, there has been compelling theoretical and empirical support that the scale-transfer of kinetic energy (KE) is local. Here, we analyze the locality of KE scale-transfer in compressible turbulence. There is a common notion that shocks and discontinuities that pervade compressible turbulence necessarily imply a non-local scale-transfer. We show this not to be the case by demonstrating rigorous proofs of scale-locality using two examples: (i) solution to the Burgers equation and (ii) the 1D normal shock solution. Proofs of scale-locality in compressible turbulence hold in broad generality, at any Mach number, for any equation of state, and without the requirement of homogeneity or isotropy. Rather, locality rests on assumptions about the scaling of velocity, pressure, and density structure functions, which are weak and enjoy broad empirical support.
Turbulence in Compressible Systems and Energy Transfer Across Scale
Published:
In this talk, I began with the levels of describing a system of particles, arrived at the Navier-Stokes equation as the first-order approximation of the Chapman-Enskog expansion, and laid the foundation for the study of turbulence. I then began with the theory we have in incompressible turbulence, elaborated on coarse-graining as a direct application of the representation theory, and discussed the theory of scale dynamics in compressible systems.
teaching
MATLAB Course - Fall 2021
Undergraduate Electives Course, Amirkabir University of Technology, 2021
I instructed an undergraduate MATLAB course at Amirkabir University of Technology during the Fall 2021 term. The course aimed to equip students with fundamental programming skills in MATLAB, focusing on numerical computations, algorithm implementation, and data visualization.