Thesis Defense – Kourosh Naji (MSME)

Kourosh Naji– M.Sc. in Mechanical Engineering

Assoc. Prof. Özgür Ertunç – Advisor

Asst. Prof. Altuğ Melik Başol – Co-advisor

Date: 09.08.2024

Time: 10:30

Location: AB1 246

“NUMERICAL ANALYSIS OF FLOW AND HEAT TRANSFER CHARACTERISTICS OF GYROID TYPE STRUCTURES WITH TRIPLY PERIODIC MINIMAL SURFACES”

Assoc. Prof. Özgür Ertunç, Özyeğin University

Prof. M. Pınar Menguç, Özyeğin University

Assoc. Prof. Tamer Çalışır, Gazi University

Abstract:

The popularity of additive manufacturing has increased interest in using triply pe- riodic minimal surfaces (TPMS) in engineering applications due to their potential for superior mechanical, heat, and mass transfer properties. This study aims to un- derstand the relationship between the properties defining gyroid TPMS structures, energy losses, heat transfer, and flow structure. For this purpose, the pressure drop- flow rate characteristics of two printed TPMS structures are measured in the first stage. The TPMS structures have the same porosity but differ in the frequency of gy- roids. Later, flow simulations are conducted by using two methods: implicit unsteady incompressible Large Eddy Simulations (LES) equations along with the subgrid-scale model and steady incompressible Reynolds Averaged Navier -Stokes (RANS) equa- tions along with the k-epsilon turbulence model. Although the simulated pressure drops do not perfectly match the measured ones, the experiments and simulations show that TPMS with high frequency creates less pressure drop over the whole range of mass flow rates. The simulation results revealed the same heat transfer rate char- acteristic for both frequencies. The difference in the pressure drop is investigated by looking at how much energy dissipation occurs near and away from the wall.

Bio:

Kourosh Naji received his B.Sc degree in Mechanical Engineering from Islamic Azad University He is currently pursuing an M.Sc in Mechanical Engineering at Özyeğin University and his research interests are fluid mechanics and computational fluid dynamics.