Distribution of pressure coefficient along the external profile of rural house exposed to windstorm in Malaysia using computational fluid dynamics (cfd) / Siti Noratikah Che Deraman
Kajian terhadap kesan aliran angin di sekeliling rumah luar bandar menjadi fokus di dalam kajian ini. Kajian lapangan selepas angin ribut menunjukkan banyak kerosakan bumbung pada rumah dapur dan bukan hanya pada rumah ibu. Walaubagaimanapun, kajian-kajian lepas terhad kepada bangunan tinggi dan rendah tanpa ruang tambahan (rumah dapur) berbanding rumah luar bandar di bahagian Utara di Semenanjung Malaysia. Kajian berangka menggunakan simulasi Perkomputeran Dinamik Bendalir dijalankan untuk mensimulasikan aliran angin terhadap rumah luar bandar, seterusnya menghasilkan taburan tekanan di sekeliling rumah dan disahkan dengan keputusan ujian terowong angin. Oleh itu, kajian ini dijalankan untuk mengkaji kesan juntaian, sudut bumbung, ketinggian jurang dan kedudukan rumah dapur ke atas aliran angin di sekeliling rumah luar bandar menggunakan Perkomputeran Dinamik Bendalir. Persamaan RANS menggunakan model bergelora RNG 𝑘−𝜀 diperkenalkan untuk menyelesaikan masalah aliran dalam kajian ini. Sedutan tertinggi di batas bumbung (CP =-2.28) telah direkod untuk model rumah dapur berada di tengah. Pekali tekanan yang tertinggi di tinggi sela telah direkod menjadi 0.97 untuk model dengan 0.25 m sela. Sementara itu, model yang bersudut bumbung 17° telah membangunkan sedutan tertinggi di batas bumbung dengan nilai pekali tekanan -2.28. Kesan sedutan tertinggi berlaku di juntaian bumbung dengan nilai pekali tekanan bersih dikira menjadi -2.35 dan tidak berlaku di batas bumbung. Akhir sekali, keputusan dari rekabentuk ekperimen menunjukkan juntaian bumbung dan sudut bumbung memberi kesan kuat kepada nilai CP sedangkan juntaian bumbung, sudut bumbung dan kedudukan rumah dapur menyumbangkan kesan interaksi yang kuat.
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The study of effects of wind flow surrounding the rural house become the focus of the present study. Post windstorm site-survey shows that most damages part of the roof is over the kitchen house and not only core house. However, the previous studies are limited to the high-rise building and low-rise building without extended room (kitchen house) rather than the rural house in the Northern region of Peninsula Malaysia. The numerical study using CFD simulation was performed to simulate the wind flow toward rural house, resulting a pressure distribution surrounding the house and validated with the wind tunnel test. Therefore, the study is conducted to investigate the effect of house features namely overhang, roof pitch, gap height and position of kitchen house on the wind flow surrounding the rural house using CFD. The steady-RANS equation using RNG 𝑘−𝜀 turbulence models were introduced to solve the flow problems for this study. The highest suction at the roof ridge (CP = -2.28) was recorded for the model with kitchen house located at the center. The highest pressure coefficient at the gap height was recorded to be 0.97 for model with 0.25 m gap. Meanwhile, the model with 17° roof pitch developed the highest suction at the roof ridge with the value of CP -2.28. The highest suction effect occurred on the roof overhang with the values of net CP calculated to be -2.35 and not at the roof ridge. Finally, the results using Design of Experiment show that overhang roof and roof pitch cause the most significant influence to the CP values whereas the roof overhang, roof pitch and kitchen house position contributed to the strong interaction effect.
Distribution of pressure coefficient along the external profile of rural house exposed to windstorm in Malaysia using computational fluid dynamics (cfd) / Siti Noratikah Che Deraman
Distribution of pressure coefficient along the external profile of rural house exposed to windstorm in Malaysia using computational fluid dynamics (cfd)_Siti Noratikah Che Deraman_A9_2019_MYMY