A few simple CFD models for flow simulation around groyne

An interferometric study of free convective heat transfer at an indoor glazing with an insect screen attachment

10.32920/ryerson.14664336 ◽

2021 ◽

Author(s):

Daniel Zalcman

Keyword(s):

Heat Transfer ◽

Convective Heat Transfer ◽

Convective Heat ◽

Flow Simulation ◽

Cfd Models ◽

Interferometric Study ◽

Set Up ◽

Screen Temperature ◽

Good Agreement ◽

Free Convective Heat Transfer

Free convective heat transfer from an idealized window with an insect screen attachment was studied using a Mach-Zehnder interferometer. An experimental model was set up with an isothermal plate, two commercially available screens (KHP=8.74×10-9 m2, tHP=0.29 mm and KLP=3.40×10-9 m2, tLP=0.65 mm) and window to screen spacings of b=2 cm and b=1 cm. Heat transfer measurements using finite fringe interferograms were taken at a Rayleigh number of Ra=5.30×107 based on window height. Infinite fringe interferograms were taken for temperature field visualization. Screen temperature was also measured. Experimental results were compared to a preliminary CFD model developed with SolidWorks Flow Simulation and show good agreement. The results show that an insect screen produces a reduction in the convective heat transfer from the indoor glazing. The current measurements show that the effect of window to screen spacing is small. Results from this study are expected to be used for the validation of CFD models and for the development of correlations.

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Physical and Computational Modeling for Chemical and Biological Weapons Airflow Applications

Fluids Engineering ◽

10.1115/imece2002-39451 ◽

2002 ◽

Author(s):

Kelly J. Knight ◽

Chris Barringer ◽

Jon M. Berkoe ◽

Glenn E. McCreery ◽

Robert J. Pink ◽

...

Keyword(s):

Collaborative Study ◽

Flow Simulation ◽

Index Of Refraction ◽

Biological Weapons ◽

Test Facility ◽

Cfd Models ◽

Environmental Laboratory ◽

Complex Building ◽

Chemical And Biological Weapons ◽

Computational Fluid Dynamics Cfd

There is a need for information on dispersion and infiltration of chemical and biological agents in complex building environments. A recent collaborative study conducted at the Idaho National Engineering and Environmental Laboratory (INEEL) and Bechtel Corporation Research and Development had the objective of assessing computational fluid dynamics (CFD) models for simulation of flow around complicated buildings through a comparison of experimental and numerical results. The test facility used in the experiments was INEEL’s unique large Matched-Index-of-Refraction (MIR) flow system. The CFD code used for modeling was Fluent, a widely available commercial flow simulation package. For the experiment, a building plan was selected to approximately represent an existing facility. It was found that predicted velocity profiles from above the building and in front of the building were in good agreement with the measurements.

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An interferometric study of free convective heat transfer at an indoor glazing with an insect screen attachment

10.32920/ryerson.14664336.v1 ◽

2021 ◽

Author(s):

Daniel Zalcman

Keyword(s):

Heat Transfer ◽

Convective Heat Transfer ◽

Convective Heat ◽

Flow Simulation ◽

Cfd Models ◽

Interferometric Study ◽

Set Up ◽

Screen Temperature ◽

Good Agreement ◽

Free Convective Heat Transfer

Free convective heat transfer from an idealized window with an insect screen attachment was studied using a Mach-Zehnder interferometer. An experimental model was set up with an isothermal plate, two commercially available screens (KHP=8.74×10-9 m2, tHP=0.29 mm and KLP=3.40×10-9 m2, tLP=0.65 mm) and window to screen spacings of b=2 cm and b=1 cm. Heat transfer measurements using finite fringe interferograms were taken at a Rayleigh number of Ra=5.30×107 based on window height. Infinite fringe interferograms were taken for temperature field visualization. Screen temperature was also measured. Experimental results were compared to a preliminary CFD model developed with SolidWorks Flow Simulation and show good agreement. The results show that an insect screen produces a reduction in the convective heat transfer from the indoor glazing. The current measurements show that the effect of window to screen spacing is small. Results from this study are expected to be used for the validation of CFD models and for the development of correlations.

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Investigating the Effect of Structure to Structure Separation Distance on Firebrand Accumulation

Frontiers in Mechanical Engineering ◽

10.3389/fmech.2020.628510 ◽

2021 ◽

Vol 6 ◽

Author(s):

Sayaka Suzuki ◽

Samuel L. Manzello

Keyword(s):

Built Environment ◽

Flow Simulation ◽

Fire Spread ◽

Separation Distance ◽

Strong Wind ◽

Sustainable Communities ◽

Accumulation Zone ◽

Wind Speeds ◽

Cfd Models ◽

Effect Of Structure

Wind plays an important role in the built environment. Large outdoor fires in the built environment are no exception. Under strong wind, firebrands fly far, which leads to quick fire spread. In this study, the effect of structure to structure separation distance on firebrand accumulation was investigated by using a custom designed firebrand generator installed in a real scale wind tunnel. Firebrands accumulated at 4 and 6 m s−1, but no firebrand accumulation zone was observed at 8 and 10 m s−1, regardless of separation distance (SD). Experimental results were compared with a simple CFD flow simulation (no firebrands included). The size of firebrand accumulation zone as well as distance from the structure front was compared with SD in the cases of 4 and 6 m s−1 wind speeds. It was found that firebrands behave differently from SD = 1 to 2 m, to that of SD = 2 to 3 m. The results of this study are the first to explore these important interactions between firebrands and structure separation distances. The results of this work will help develop and design sustainable communities that may better resist the destruction of increasing large outdoor fire outbreaks worldwide, as well as help develop the next generation of CFD models needed to grasp the important large outdoor fire problem and associated firebrand processes.

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