Fadl moukalled

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Prof. Saeid Eslamian

Isfahan University of Technology

Dr. Sumon Saha

Bangladesh University of Engineering & Technology

Daniel Flórez-Orrego

Ecole Polytechnique Federale de Lausanne

Mikail F Lumentut

National Taiwan University

Aashique Rezwan

University of Wisconsin-Madison

mustafa zeki yilmazoglu

Gazi University

Harijono Djojodihardjo

Institut Teknologi Bandung

Umit Unver

Yalova University

Joël Mètogbé Zinsalo, ing., Ph.D.

Ecole Polytechnique d'Abomey-Calavi

Jana Javornik

University of East London

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Development of a Novel Pressure-Based Coupled CFD Solver for Turbulent Compressible Flows in Turbomachinery Applications

Volume 1A, Symposia: Advances in Fluids Engineering Education; Advances in Numerical Modeling for Turbomachinery Flow Optimization; Applications in CFD; Bio-Inspired Fluid Mechanics; CFD Verification and Validation; Development and Applications of Immersed Boundary Methods; DNS, LES, and Hybrid R..., 2013

This paper reports on a newly developed fully coupled pressure-based algorithm for the solution o... more This paper reports on a newly developed fully coupled pressure-based algorithm for the solution of turbulent all-speed compressible flows implemented within the framework of the open-source OpenFOAM® library. In the algorithm the velocity and pressure fields are assembled into one extended system of equations that is diagonally dominant and then resolved simultaneously using a robust algebraic multigrid solver. At the heart of this algorithm is a re-derived fully coupled pressure equation that is very similar in form to the rhie-chow segregated pressure equation. After presenting the details of the coupled approach its performance is compared to that of a pressure-based SIMPLE compressible solver again implemented in OpenFOAM. A number of tests including laminar and turbulent flow problems are thus solved using both methodologies with their convergence history and computational cost compared.

The Development of a Robust Low Computational Cost Diagnostic Tool to Evaluate Stenosis Functional Significance in Human Coronary Arteries

Volume 3: Biomedical and Biotechnology Engineering, 2015

There is discordance between the anatomic severities of the coronary narrowing and their correspo... more There is discordance between the anatomic severities of the coronary narrowing and their corresponding functional significance. Fractional Flow Reserve (FFR) is among the physiological parameters invasively measured to assess the hemodynamic significance of a stenosis during maximal hyperemia. FFR values ≤ 0.8 indicate that the downstream heart tissue perfused by this vessel is at risk for ischemia. While measuring FFR is an invasive procedure that is expensive, time consuming, and not without complications, recently, noninvasive estimation of FFR was shown to be possible from comprehensive predictive techniques allowing the computation of in-vivo FFR. However, these non-invasive methods are associated with high computational cost and require high performance computing technology, thus, reducing their wide adoption in clinics. This paper is steered to achieve two main goals: (1) to develop a fast numerical method to aid clinicians assessing ischemia level and determine if coronary r...

General Thermodynamic Heat Engine Models

Journal of Non-Equilibrium Thermodynamics, 2002

Heat engine models, starting from the most fundamental Carnot case, are analyzed. Two major metho... more Heat engine models, starting from the most fundamental Carnot case, are analyzed. Two major methods of viewing the power plant as a thermodynamic heat engine are presented and studied. Realistic models are sought by introducing internal heat transport or bypass heat leak treatments. Simple treatments are presented to convey the general modeling ideas without unnecessary complications. Some new results are obtained and certain old results are commented on.

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