PIV measurements of isothermal plane turbulent impinging jets at moderate Reynolds numbers

Khayrullina, AA Adelya; Hooff, T. van; Blocken, Bje Bert; Heijst, G. J. F. van

doi:10.1007/s00348-017-2315-0

Cited by 30 publications

(24 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Princevac 2010;Pournazeri et al 2012;Cruz-Salas et al 2014;Neophytou et al 2014;Karra et al 2017) or water tank experiments (e.g. Linden et al 1990Linden et al , 1999Hunt and Linden 1999;Bolster and Linden 2007;Livermore and Woods 2007;Yu et al 2007;Tapsoba et al 2007;Kang and Lee 2008;Morsing et al 2008;Chen 2009;Etheridge 2011;Thomas et al 2011;van Hooff et al 2012a,b;Partridge and Linden 2013;Khayrullina et al 2017). Each approach has its specific advantages and disadvantages.…”

Section: Introductionmentioning

confidence: 99%

LES over RANS in building simulation for outdoor and indoor applications: A foregone conclusion?

2018

View full text Add to dashboard Cite

Large Eddy Simulation (LES) undeniably has the potential to provide more accurate and more reliable results than simulations based on the Reynolds-averaged Navier-Stokes (RANS) approach. However, LES entails a higher simulation complexity and a much higher computational cost. In spite of some claims made in the past decades that LES would render RANS obsolete, RANS remains widely used in both research and engineering practice. This paper attempts to answer the questions why this is the case and whether this is justified, from the viewpoint of building simulation, both for outdoor and indoor applications. First, the governing equations and a brief overview of the history of LES and RANS are presented. Next, relevant highlights from some previous position papers on LES versus RANS are provided. Given their importance, the availability or unavailability of best practice guidelines is outlined. Subsequently, why RANS is still frequently used and whether this is justified or not is illustrated by examples for five application areas in building simulation: pedestrian-level wind comfort, near-field pollutant dispersion, urban thermal environment, natural ventilation of buildings and indoor airflow. It is shown that the answers vary depending on the application area but also depending on other-less obvious-parameters such as the building configuration under study. Finally, a discussion and conclusions including perspectives on the future of LES and RANS in building simulation are provided.

show abstract

Section: Introductionmentioning

confidence: 99%

LES over RANS in building simulation for outdoor and indoor applications: A foregone conclusion?

2018

View full text Add to dashboard Cite

show abstract

“…Seeding was provided by polyamide particles (D S = 50 μm, density ρ S = 1,030 kg/m 3 ) added to the water. The particles were illuminated by means of a Khayrullina et al 2017) light sheet delivered at the bottom of the water channel. The PIV measurements provided information on the mean velocities and turbulence intensities in the vertical centerplane.…”

Section: Reduced-scale Piv Measurementsmentioning

confidence: 99%

“…The PIV measurements provided information on the mean velocities and turbulence intensities in the vertical centerplane. More information on the experimental set-up and measurement results can be found in Khayrullina et al (2017). The experimental results will be shown together with the CFD results in the following subsections.…”

Section: Reduced-scale Piv Measurementsmentioning

confidence: 99%

“…With regard to basic studies, a non-exhaustive overview of experimental studies on PTIJs up to 2016 is provided in Khayrullina et al (2017). These experimental studies highlighted the existence of vortical structures in the jet flow, their role in the dissipation of jet energy to the ambient environment, and the existence of 3D vortices in the impingement region, in which thermal energy can be exchanged between the jet and the impingement surface.…”

Section: Introductionmentioning

confidence: 99%

“…2D steady RANS CFD simulations are performed for jet Reynolds numbers ranging from 5,000 to 30,000. First, the computational model is validated based on particle image velocimetry (PIV) data by Khayrullina et al (2017). Subsequently, a parametric study is performed, in which the influence of several jet parameters on jet separation efficiency is evaluated.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Minimum momentum flux ratio required to prevent air curtain breakthrough in case of cross-curtain pressure gradients: CFD versus analytical equation

Khayrullina¹,

Hooff

Ruiz

et al. 2020

Build. Simul.

View full text Add to dashboard Cite

This paper presents a numerical study on the required momentum flux ratio to prevent air curtain breakthrough in case of cross-curtain (i.e. cross-jet) pressure gradients. 2D steady Reynolds-averaged Navier-Stokes (RANS) CFD simulations with the RNG k-ε turbulence model are employed for jet Reynolds numbers ranging from 5,000 to 30,000. First, the computational model is validated based on particle image velocimetry (PIV) measurements. Second, the influence of several jet parameters on the separation efficiency is evaluated for a moderate cross-jet pressure difference of 10 Pa. These are the ratio of the jet discharge momentum flux to the jet cross-flow momentum flux (momentum flux ratio), the jet height-to-width ratio and the jet discharge angle. Finally, the minimum deflection modulus to prevent jet breakthrough and the corresponding momentum flux ratio by an analytical equation and by CFD are compared. The results show that, for the configuration under study: (1) jets with the smallest height-to-width ratios (β = 18) provide the highest separation efficiency; (2) inclined jets with discharge angles α0 = 5° and 10° provide slightly higher separation efficiency than straight jets (α0 = 0°) and jets with α0 = 20°; (3) the maximum modified separation efficiency is reached at lower momentum flux ratios for jets with smaller height-to-width ratios and for inclined jets; (4) the analytical and CFD values of the optimal momentum flux ratio differ with up to 31.2%. This study shows how the separation efficiency of air curtains can be improved by adjusting certain jet parameters.

show abstract

Numerical studies of metal particle behaviors inside the selective laser melting (SLM) chamber through computational fluid dynamics (CFD)

Tzeng

Chen

Wang

2020

Int J Adv Manuf Technol

View full text Add to dashboard Cite

PIV measurements of isothermal plane turbulent impinging jets at moderate Reynolds numbers

Cited by 30 publications

References 42 publications

LES over RANS in building simulation for outdoor and indoor applications: A foregone conclusion?

LES over RANS in building simulation for outdoor and indoor applications: A foregone conclusion?

Minimum momentum flux ratio required to prevent air curtain breakthrough in case of cross-curtain pressure gradients: CFD versus analytical equation

Numerical studies of metal particle behaviors inside the selective laser melting (SLM) chamber through computational fluid dynamics (CFD)

Contact Info

Product

Resources

About