Conjugate Heat Transfer Analysis for a Finite Thickness Cylinder in a Hypersonic Flow

Abstract

Prediction of surface heating rates is of prime importance for the hypersonic flow regime. Experimental and conventional computational efforts overlook the heat transfer phenomenon in the solid due to the rigid assumptions involved in the solution methodologies. In order to address this fact, conjugate heat transfer (CHT) studies are carried out using various coupling techniques to examine their implementation abilities. Three types of solution methodologies are adopted, namely, decoupled, strongly coupled, and loosely coupled analysis. This study is also focused on looking into the effect of a hypersonic flow field on wall heat flux for a finite thickness insulating cylinder at moderately large time scales. Increase in wall temperature and decrease in surface heat flux have been noticed using strong and loose coupling techniques with an increase in simulation time. Decoupled fluid and solid domain analysis is found to be useful for typical shock tunnel test durations (∼1 ms) while investigations with loose coupling techniques are advisable for time scales corresponding to flight testing (∼1 s). Efforts are also made to reason the discrimination in prediction of stagnation point heat flux using conventional computational and experimental analysis.

Shock wave boundary layer interactions in hypersonic flows over a double wedge geometry by using conjugate heat transfer

“…The fluid and solid computational domains with the respective boundary conditions are shown in Figure 1. Further details of this fluid flow solver and CHT solver are available in the open literature 30 . Two conditions viz.…”

“…In the present investigations, this critical value is taken as 1% of the noted maximum temperature. 30 Attainment of this criterion reinitiates simultaneous computations of the solid and fluid domain.…”

“…Further details of this fluid flow solver and CHT solver are available in the open literature. 30 Two conditions viz. continuity of heat flux and uniqueness of the temperature are considered at the interface in the present loose coupling techniques (LC-CHT).…”

“…continuity of heat flux and uniqueness of the temperature are considered at the interface in the present loose coupling techniques (LC-CHT). 30 The flowchart of the LC-CHT technique adopted herein is given in Figure 2. In this technique, the fluid flow solver and conduction solver are solved simultaneously until the residue of the fluid domain attains a preset value.…”

Conjugate heat transfer from a circular cylinder to a power‐law non‐Newtonian fluid

“…Jeon et al numerically explored conjugate heat transfer from a circular cylinder with a heat source to water. Peetala et al focused on looking into the effect of a hypersonic flow field on wall heat flux for a finite thickness insulating cylinder at moderately large timescales. Their efforts were also made to explain the discrimination in prediction of stagnation point heat flux using conventional computational and experimental analysis.…”