Journal Articles

Permanent URI for this collectionhttps://idr.nitk.ac.in/handle/123456789/19884

Browse

Filters

2011 - 20122

Settings

Author: search.filters.author.Yaragal, S.C.Subject: search.filters.subject.flow field

Search Results

Now showing 1 - 2 of 2
  • No Thumbnail Available
    Item
    Study on shelter effect of solid wind fences
    (2011) Umesh, U.; Prashanth, J.; Yaragal, S.C.; Nagaraj, M.K.
    In this paper the shelter effect of solid wind fence is investigated. A solid fence was considered with different bottom gap ratios (ratio of bottom gap to the height of the fence) of 0, 0.1, 0.2 and 0.3. The numerical analysis was done for different free stream velocities of 7.5 m/s, 10 m/s and 12.5 m/s. The results obtained were compared with the results of wind tunnel testing and flow visualization. Comparison between the experimental and numerical results showed a fairly good agreement. Flow visualization technique provided sufficient information for planning and conducting flow field measurements with a clear demarcation of reattachment length. The modified k- ? turbulence model predicted the flow well. From both the experimental and numerical investigation it is shown that a fence with gap ratio of 0.1 is effective in providing good shelter effect. © 2011 CAFET-INNOVA TECHNICAL SOCIETY. All rights reserved.
  • No Thumbnail Available
    Item
    Investigation of 2-d wake pressures downstream of perforated plates
    (2012) Yaragal, S.C.
    The construction, calibration and measurements made by a built up static pressure probe for measurement of unsteady pressures in the flow field are discussed. The wind tunnel experiments were conducted on a series of two-dimensional perforated normal plates to an air stream to study the characteristics of unsteady wake pressures and to ascertain if they could be correlated in some way. The velocity ranged from 5 to 15 m/s in the present study. The pressure field gets significantly modified as the perforation level increases. The present study is concerned with three plates with perforation level of 0%, 25% and 35%. There appears to be a correlation between the maximum normalized value of the R.M.S pressure fluctuation levels, base pressure and the perforation level of the normal plate. © 2012 CAFET-INNOVA TECHNICAL SOCIETY.