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All Journal IPTEK The Journal for Technology and Science Limits: Journal of Mathematics and Its Applications Limits: Journal of Mathematics and Its Applications
Triyogi Yuwono
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Computer Science & IT Mathematics

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Plane Wall Effect of Flow around Two Circular Cylinders in Tandem Arrangement Triyogi Yuwono; Wawan Aries Widodo; Heru Mirmanto; Fahmi Fahreza
IPTEK The Journal for Technology and Science Vol 22, No 1 (2011)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20882033.v22i1.56

Abstract

The flow characteristic around two circular cylinders in tandem arrangement located near a plane wall were investigated experimentally in a uniform flow at a Reynolds Number of 5.3 x 104. The center to center spacing between the two cylinders relative to the cylinder diameter was constantly maintained at P/D = 1.5. The pressure distributions along the surface of the cylinder and the plane wall were measured by varying the gap-to-diameter of cylinder ratio (G/D) in the range of 0 < G/D < 0.467. Surface oil-film techniques were used to investigate the flow patterns on the cylinder. The result showed that for upstream cylinder, in the gap-to-diameter ratio G/D < /D, there is no stagnation point at front side of the upstream cylinder; it is gradually raised as the gap increase. For the downstream cylinder, a peak on the lower side of the front side of the cylinder is apparent in each of the pressure distributions. This peak represents the reattachment of shear layer that separates from lower side of the upstream cylinder. The reattachment point tends to move forward close to the angular position of  = 0o as the gap ratio increase. The shear layer bifurcates into two shear layers. One shear layer continues in the downstream direction, and the other shear layer flows in the upstream direction.
Pengaruh Pasif Kontrol terhadap Koefisien Hambat Chairul Imron; Basuki Widodo; Triyogi Yuwono
Limits: Journal of Mathematics and Its Applications Vol 16, No 1 (2019)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (389.346 KB) | DOI: 10.12962/limits.v16i1.4329

Abstract

Salah satu cara untuk mengurangi koefisien hambat adalah dengan menambahkan obyek kecil yang dinamakan pasif kontrol. Tiga pasif kontrol, terdiri satu pasif kontrol berbentuk silinder tipe-I diletakkan di depan dan dua silinder sirkular diletakkan di belakang silinder sirkular utama. Diameter silinder sirkular utama adalah D dan tiga silinder pasif kontrol berdiameter . Rasio jarak antara pasif kontrol di depan dengan silinder sirkular utama adalah  dan dua pasif kontrol di belakang silinder sirkular yaitu  dan besar sudut α= 15°, 30°, 45° dan 60°. Bilangan Reynolds yang digunakan adalah Re = 1000. Konfigurasi yang tepat untuk menurunkan koefisien hambat terjadi ketika rasio jarak  dan  dengan . Koefisien hambat yang diterima silinder sirkular dapat berkurang hingga 42.98%
Pengaruh Pasif Kontrol terhadap Koefisien Hambat Chairul Imron; Basuki Widodo; Triyogi Yuwono
Limits: Journal of Mathematics and Its Applications Vol. 16 No. 1 (2019): Limits: Journal of Mathematics and Its Applications Volume 16 Nomor 1 Edisi Ag
Publisher : Pusat Publikasi Ilmiah LPPM Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Salah satu cara untuk mengurangi koefisien hambat adalah dengan menambahkan obyek kecil yang dinamakan pasif kontrol. Tiga pasif kontrol, terdiri satu pasif kontrol berbentuk silinder tipe-I diletakkan di depan dan dua silinder sirkular diletakkan di belakang silinder sirkular utama. Diameter silinder sirkular utama adalah D dan tiga silinder pasif kontrol berdiameter . Rasio jarak antara pasif kontrol di depan dengan silinder sirkular utama adalah  dan dua pasif kontrol di belakang silinder sirkular yaitu  dan besar sudut a= 15°, 30°, 45° dan 60°. Bilangan Reynolds yang digunakan adalah Re = 1000. Konfigurasi yang tepat untuk menurunkan koefisien hambat terjadi ketika rasio jarak  dan  dengan . Koefisien hambat yang diterima silinder sirkular dapat berkurang hingga 42.98%
Co-Authors Basuki Widodo Chairul Imron Chairul Imron, Chairul Fahmi Fahreza Heru Mirmanto Wawan Aries Widodo