Abstract The statistical behaviour of the transport reaction progress variable variance, $$\widetilde{{c^{^{\prime\prime}2} }},$$ c ″ 2 ~ , and non-dimensiona...

The present investigation concerns the development of advanced scalar turbulence modeling approaches and their application to the calculation of non-isothermal wall-bounded flow phenomena. A new scalar modeling technique based on scalar turbulent scales is proposed and implemented at a second-order modeling approach. Instead of the classical analogy concept between the mechanical and the scalar...

A direct numerical simulation (DNS) with finite rate chemistry was performed to evaluate the main influences on carbon monoxide (CO) emissions in gas turbine combustion. lean methane/air mixture is burned fully turbulent jet flames a domain enclosed by isothermal walls. The formation of CO found be affected mean strain flow, flame-wall interaction (FWI), and interactions flame recirculation zon...

The influence of thermal wall boundary conditions on the behaviour scalar statistics during flame-wall interaction (FWI) premixed flames within turbulent layers has been investigated. Three-dimensional direct numerical simulations (DNS) two different flow configurations for interacting with chemically inert isothermal as well adiabatic walls in fully developed have performed. first configuratio...

This paper investigates flow patterns and heat transfer characteristics inside the Liquid Piston (LP) column during a complete compression–cooling–expansion (CCE) cycle. The phenomena associated to this cycle have not been yet well-documented but are essential understand mechanisms for piston geometry optimization. A 3D CFD model based on VOF method Particle Image Velocimetry (PIV) technique us...

The impact of periodic pulsation normal to the flow passage on heat and momentum transport is studied using direct numerical simulations. selected test case fully developed supersonic turbulent at Reynolds numbers Reb=ρ¯bU¯bδ/μ¯wall=3000 6000 Mach number Mcl=U¯cl/c¯cl≈1.5, bounded by isothermal walls. introduced imposing a time-periodic uniform body-force in spanwise directions, mimicking two a...

The higher regularity estimate has been a challenging question regarding the Boltzmann equation in bounded domains. Indeed, it is well-known to have “the non-existence of second order derivative at boundary” Guo et al. (Invent Math 207:115–290, 2017) even for symmetric convex domains such as disk or sphere. In this paper, we answer affirmative by constructing $$C^{1,\beta }$$ solutions away fro...

The heat resistance of Campylobacter jejuni strains AR6 and L51 and the heat resistance of Campylobacter coli strains DR4 and L6 were measured over the temperature range from 50 to 60 degrees C by two methods. Isothermal measurements yielded D55 values in the range from 4.6 to 6.6 min and z values in the range from 5.5 to 6.3 degrees C. Dynamic measurements using differential scanning calorimet...

This paper presents the results of experimental measurements and computational fluid dynamics (CFD) simulations of the indoor environment of an open-plan office. The measurements were conducted in the Indoor Environment Research Facility (IERF) at IRC/NRC, in which six mock-up were setup to simulate an interior open-plan office. Two scenarios were investigated: isothermal and non-isothermal. Th...