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    COMPUTATIONAL ANALYSIS OF FLOW CHARACTERISTICS AROUND A TWIN-SPLINED CYLINDER WITHIN A 2-D CHANNEL
    (2024-01-01)
    Chamoli, Sunil
    ;
    Sahi, Samarth
    ;
    Jaiswal, Shivam
    ;
    Negi, Anant
    ;
    Pant, Pawan Kumar
    In the present research work, external flow-induced stresses on a circular cylinder with double-splined surfaces are investigated at a Reynolds number Re of 100. Opposite sides of the cylinder have splined surfaces. The splines are positioned between 0° and 90° from the cylinder's front and rear stagnation points. It is demonstrated that the spline on the cylinder's leading edge modifies the vortex dynamics and causes considerable changes in flow-induced forces. At Re = 100, when a spline is placed on a cylinder's surface, noticeable reduction is observed in the coefficients of lift and drag compared to a smooth cylinder. When the inclination angle is increased to a maximum of 60°, the stagnation point moves to the windward side. Additionally, the spline in the front and back side of the cylinder significantly strengthens the vortex flow. At inclinations of 90° and 0°, maximal and minimal vorticities are obtained. Furthermore, the present work's double-spline cylinder demonstrates the advantage of reduced drag over many previously reported bluff bodies.
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    Trial of an evaluation method of the building damage by Tsunami
    (2012-06-01)
    Charusrojthanadech, Nunthawath
    ;
    Yamamoto, Yoshimichi
    ;
    Ca, Vu Thanh
    In order to develop a rational methodology to evaluate building damage caused by tsunamis, first, disaster data collected in Thailand, Sri Lanka, and Japan are introduced as verification data. Next, the applicability of an empirical method of predicting inundation depth (= the inundation height from ground level) based on analysis of those data and a numerical simulation method of tsunami flood is examined by comparing calculation values with the verification data. Then, the validity of a convenient method of evaluating building strength against the tsunami using the gate-type Rahmen Building Model is checked by comparing calculation results with actual damage and diagrams to get pillar widths or wall thicknesses at the breaking threshold for common sizes of buildings are proposed. © World Scientific Publishing Company.
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    Trial of damage evaluation by Indian ocean tsunami in patong beach of Thailand
    (2011-01-01)
    Charusrojthanadech, Nunthawath
    ;
    Yamamoto, Yoshimichi
    ;
    Ca, Vu Thanh
    A huge tsunami caused by the giant earthquake occurred off Sumatra in Indonesia, on 26th December 2004, attacked the coastal regions of many countries facing the Indian Ocean. This paper describes evaluation methods of structural damage in order to mitigate the damage by huge tsunamis. First, the damage by this tsunami at Patong Beach in Phuket province of Thailand is explained. Next, diagrams to get critical inundation heights which break buildings are shown by using a rigid frame model as functions of inundation heights. Then, how to get the inundation height empirically is explained. Moreover, a numerical model to simulate the inundation height is also used, because the method described previously will give inundation heights of low accuracy as geographical feature becomes complicated. Furthermore, there were some structural collapses (a masonry wall and so on) by tsunami back-flow; the stability of a concrete wall against the back-flow is also discussed. © 2011 World Scientific Publishing Company and Japan Society of Civil Engineers.