22 citations · 62 across the 9 of their papers we have counts for
9 papers
Dynamic Nonlocal Passive Scalar Subgrid-Scale Turbulence Modeling
S. Hadi Seyedi, Ali Akhavan-Safaei, Mohsen Zayernouri
Extensive experimental evidence highlight that scalar turbulence exhibits anomalous diffusion and stronger intermittency levels at small scales compared to that in fluid turbulence…
A Nonlocal Spectral Transfer Model and New Scaling Law for Scalar Turbulence
Ali Akhavan-Safaei, Mohsen Zayernouri
In this study, we revisit the spectral transfer model for the turbulent intensity in the passive scalar transport (under large-scale anisotropic forcing), and a subsequent modifica…
Tempered Fractional LES Modeling
Mehdi Samiee, Ali Akhavan-Safaei, Mohsen Zayernouri
The presence of nonlocal interactions and intermittent signals in the homogeneous isotropic turbulence grant multi-point statistical functions a key role in formulating a new gener…
A Parallel Integrated Computational-Statistical Platform for Turbulent Transport Phenomena
Ali Akhavan-Safaei, Mohsen Zayernouri
In this paper, we present an open-source, automated, and multi-faceted computational-statistical platform to obtain synthetic homogeneous isotropic turbulent flow and passive scala…
Data-Driven Fractional Subgrid-scale Modeling for Scalar Turbulence: A Nonlocal LES Approach
Ali Akhavan-Safaei, Mehdi Samiee, Mohsen Zayernouri
Filtering the passive scalar transport equation in the large-eddy simulation (LES) of turbulent transport gives rise to the closure term corresponding to the unresolved scalar flux…
Anomalous Features in Internal Cylinder Flow Instabilities subject to Uncertain Rotational Effects
Ali Akhavan-Safaei, S. Hadi Seyedi, Mohsen Zayernouri
We study the flow dynamics inside a high-speed rotating cylinder after introducing strong symmetry-breaking disturbance factors at cylinder wall motion. We propose and formulate a…
Modernizing Titan2D, a Parallel AMR Geophysical Flow Code to Support Multiple Rheologies and Extendability
Nikolay A. Simakov, Renette L. Jones-Ivey, Ali Akhavan-Safaei +3
In this work, we report on strategies and results of our initial approach for modernization of Titan2D code. Titan2D is a geophysical mass flow simulation code designed for modelin…
A Fractional Subgrid-scale Model for Turbulent Flows: Theoretical Formulation and a Priori Study
Mehdi Samiee, Ali Akhavan-Safaei, Mohsen Zayernouri
Coherent structures/motions in turbulence inherently give rise to intermittent signals with sharp peaks, heavy-skirt, and skewed distributions of velocity increments, highlighting…
Comparative analysis of the structures and outcomes of geophysical flow models and modeling assumptions using uncertainty quantification
Abani K. Patra, Andrea Bevilacqua, Ali Akhavan-Safaei +3
We present a new statistically driven method for analyzing the modeling of geophysical flows. Many models have been advocated by different modelers for such flows incorporating dif…