Dr. Issa Omle

University of Miskolc, Miskolc, Borsod-Abaúj-Zemplén, Hungary

Assistant professor at University of Miskolc

Dr. Issa Omle

University of Miskolc, Miskolc, Borsod-Abaúj-Zemplén, Hungary

Assistant professor at University of Miskolc

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Academic Career Length

6Years (2021-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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19 September 2024 in International Journal of Thermofluids

Journal Article

Enhancing the melting rate of RT42 paraffin wax in a square cell with varied copper fin lengths and orientations: A numerical simulation

Saif Ali Kadhim

Karrar A. Hammoodi

Mohammed J. Alshukri

Issa Omle

Karrar K. Abdul Hussein

Ammar Elsheikh

30 September 2023 in Results in Engineering

Journal Article

Applying recent efficient numerical methods for long-term simulations of heat transfer in walls to optimize thermal insulation

Issa Omle

Endre Kovács

Betti Bolló

20 August 2021 in Computation

Journal Article

Stable, Explicit, Leapfrog-Hopscotch Algorithms for the Diffusion Equation

ÁN

In this paper, we construct novel numerical algorithms to solve the heat or diffusion equation. We start with 10⁵ different leapfrog-hopscotch algorithm combinations and narrow this selection down to five during subsequent tests. We demonstrate the performance of these top five methods in the case of large systems with random parameters and discontinuous initial conditions, by comparing them with other methods. We verify the methods by reproducing an analytical solution using a non-equidistant mesh. Then, we construct a new nontrivial analytical solution containing the Kummer functions for the heat equation with time-dependent coefficients, and also reproduce this solution. The new methods are then applied to the nonlinear Fisher equation. Finally, we analytically prove that the order of accuracy of the methods is two, and present evidence that they are unconditionally stable.

26 August 2021 in Mathematical and Computational Applications

Journal Article

New Stable, Explicit, Shifted-Hopscotch Algorithms for the Heat Equation

ÁN

Our goal was to find more effective numerical algorithms to solve the heat or diffusion equation. We created new five-stage algorithms by shifting the time of the odd cells in the well-known odd-even hopscotch algorithm by a half time step and applied different formulas in different stages. First, we tested 10⁵ = 100,000 different algorithm combinations in case of small systems with random parameters, and then examined the competitiveness of the best algorithms by testing them in case of large systems against popular solvers. These tests helped us find the top five combinations, and showed that these new methods are, indeed, effective since quite accurate and reliable results were obtained in a very short time. After this, we verified these five methods by reproducing a recently found non-conventional analytical solution of the heat equation, then we demonstrated that the methods worked for nonlinear problems by solving Fisher’s equation. We analytically proved that the methods had second-order accuracy, and also showed that one of the five methods was positivity preserving and the others also had good stability properties.

18 February 2025 in Results in Engineering

Journal Article

Influence of the typical twisted tape inserts into the inner tube of double-pipe heat exchanger: A limited review

Saif Ali Kadhim

Karrar A. Hammoodi

Hayder Mohsin Ali

Farhan Lafta Rashid

Hussein Togun

Issa Omle

8 June 2023 in Energies

Journal Article

Comparison of the Performance of New and Traditional Numerical Methods for Long-Term Simulations of Heat Transfer in Walls with Thermal Bridges

Several previous experiments showed that the leapfrog–hopscotch and the adapted Dufort–Frankel methods are the most efficient among the explicit and stable numerical methods to solve heat transfer problems in building walls. In this paper, we extensively measure the running times of the most successful methods and compare them to the performance of other available solvers, for example, ANSYS transient thermal analysis and the built-in routines of MATLAB, where three different mesh resolutions are used. We show that the running time of our methods changes linearly with mesh size, unlike in the case of other methods. After that, we make a long-term simulation (one full winter month) of two-dimensional space systems to test the two best versions of the methods. The real-life engineering problem we solve is the examination of thermal bridges with different shapes in buildings to increase energy efficiency.

About Me

I completed a five-year mechanical engineering program at the University of Homs and earned my master's degree in 2019. I then worked as a teaching assistant and simulation engineer for five years until 2020. In the same year, I began my PhD study at the University of Miskolc, where I successfully defended my thesis and obtained my PhD with Summa Cum Laude in late 2024. I gained industry experience as a trainee at Euroil Industrial & Trade Co. Ltd. in Miskolc. Since September 2024, I am a teacher at the University of Miskolc, at the Institute of Physics and Electrical Engineering. My technical expertise includes heat transfer, renewable energy, CFD, and finite element method (FEM). I am proficient in design software, artificial neural networks, and developing engineering solutions. Additionally, I possess strong planning, problem-solving, and multitasking skills and adapt well to new challenges. I have contributed to several scientific articles and conferences, and my long-term goal is to continue my research and teaching career. My primary research focuses on elaborating and optimizing methods to investigate heat transfer problems in building components.

Dr. Issa Omle

Dr. Issa Omle

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