Documents in the NTIS Technical Reports collection are the results of federally funded research. They are directly submitted to or collected by NTIS from Federal agencies for permanent accessibility to industry, academia and the public.  Before purchasing from NTIS, you may want to check for free access from (1) the issuing organization's website; (2) the U.S. Government Printing Office's Federal Digital System website http://www.gpo.gov/fdsys; (3) the federal government Internet portal USA.gov; or (4) a web search conducted using a commercial search engine such as http://www.google.com.
Accession Number ADA568645
Title Effects of Support Structure Porosity on the Drift Accumulation Surrounding an Elevated Building.
Publication Date Sep 2012
Media Count 42p
Personal Author A. Song R. Haehnel
Abstract This study focuses on the effects of elevated building substructure porosity on the accumulation of drifting snow. We conducted wind tunnel experiments of the snowdrift accumulation and numerical simulations to determine the flow field around a prototypical elevated building (based on the Martin A. Pomerantz Observatory or MAPO) with varying substructure porosity. We found that the total drift volume accumulated decreases as the substructure porosity increases (i.e., the substructure has less clutter). Furthermore, substructure porosity influenced the proportion of the drift deposited upwind or downwind of the structure, with a more porous substructure depositing most of the drift upwind of the structure; for low substructure porosity, most of the drift is deposited in the lee of the structure. Numerical simulations revealed that, for low substructure porosity a separation bubble can form upwind of the building that appears to direct particles over the upwind region of subcritical shear stress and suppress formation of the upwind snowdrift. Porosity and the presence of ground-based clutter also affected the rate of drift encroachment. The results of this study suggest that applying care in the design of the substructure could prolong the life of a building by 2 or more years.
Keywords Accumulation
Buildings
Drift accumulation
Elevated building substructure porosity
Elevated buildings
Foundations(Structures)
Mathematical models
Physical modeling
Porosity
Snowdrifts
Wind direction
Wind tunnel experiments
Wind tunnels


 
Source Agency Non Paid ADAS
NTIS Subject Category 55C - Meteorological Data Collection, Analysis, & Weather Forecast
48H - Snow, Ice, & Permafrost
44G - Environmental & Occupational Factors
89D - Structural Analyses
Corporate Author Engineering Research and Development Center, Hanover, NH. Cold Regions Research and Engineering Lab.
Document Type Technical report
Title Note Final rept.
NTIS Issue Number 1312
Contract Number N/A

Science and Technology Highlights

See a sampling of the latest scientific, technical and engineering information from NTIS in the NTIS Technical Reports Newsletter

Acrobat Reader Mobile    Acrobat Reader