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All Journal MEDIA KOMUNIKASI TEKNIK SIPIL Journal of Aero Technology
Syariefatunnisa, Syariefatunnisa
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Civil Engineering, Building, Construction & Architecture

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KAJIAN EKSPERIMENTAL SOFT FLUTTER PADA MODEL SEKSIONAL JEMBATAN Saputra, Angga Dwi; Syariefatunnisa, Syariefatunnisa
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Publisher : BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (748.503 KB) | DOI: 10.29122/joat.v1i2.3068

Abstract

Aeroelastic testing of a sectional bridge model in a wind tunnel with scale 1:20 had been conducted. The model was tested to study the characterictis of aeroelastics dynamic, such as Vortex Induced Vibration (VIV) and flutter. Based on the testing, phenomenon soft flutter was found in the test. Soft flutter has different characteristics as classical or hard flutter. In hard flutter, there are  obvious divergence point, which is the point of wind speed when  the amplitude increases suddenly and might be catastrophic. In soft  flutter phenomenon, the vibration amplitude increases gradually as increasing of wind speed. In this paper, the characteristics of soft flutter on a model will be described and the method to determine its critical flutter speed.Keywords: Aeroelastic, flutter, divergence, critical flutter speedAbstrakPengujian aeroelastika di terowongan angin pada model seksional jembatan dengan skala 1:20 dilakukan untuk mengetahui karakteristik aeroelastika dinamik, yaitu Vortex Induced Vibration (VIV) dan flutter. Berdasarkan hasil pengujian terlihat fenomena flutter yang terjadi adalah soft flutter. Fenomena soft flutter berbeda dengan classical flutter atau hard flutter, dimana pada hard flutter terdapat titik divergen yang jelas. Pada hard flutter titik divergen ditandai dengan naiknya amplitudo menjadi sangat besar secara tiba-tiba dan dapat mengakibatkan kerusakan yang fatal. Pada soft flutter amplitudo getaran akan meningkat secara bertahap dengan bertambahnya kecepatan angin. Makalah membahas karakteristik soft flutter yang terjadi dan metode untuk menentukan kecepatan kritis flutter.Kata kunci : Aeroelastika, flutter, divergen, kecepatan kritis flutter
Pemodelan Numerik Aliran Angin di Sekitar Gedung Tinggi Menggunakan Metode RANS Standard K-ε dengan Program OpenFOAM Sanjaya, Yongky; Priambodo, Doni; Sarli, Prasanti Widyasih; Setio, Herlien Dwiarti; Syariefatunnisa, Syariefatunnisa
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 28, Nomor 1 (2022)
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1052.967 KB) | DOI: 10.14710/mkts.v28i1.37375

Abstract

Amplified wind loads around buildings could induce structural failure, thus making it important to understand the behavior of fluid flow between buildings. In this study, the analysis is performed using RANS, a computational fluid dynamics (CFD) simulation with faster computation time compared to other methods. OpenFOAM, an open-source software, is used to run the simulations. This study used a structured mesh with standard RANS k − ε turbulence model. Four symmetrical buildings with a scale of 1: 420 are used as the model of this study. Numerical modelling of different computational domain size and different degrees of fineness of the meshing is simulated to determine margin of errors. The result indicates that changes in computational domain has a significant effect on CFD analysis in lowering the error value in area with high flow speed ratio (U/U0> 1) to reach the acceptable error limit. Contrastingly, changes in the degree of fineness of the meshing do not give a significant change in error value. A relatively coarse meshing with fast computation time could give a similar result as A fine meshing model with longer computation time.
Co-Authors Angga Dwi Saputra Doni Priambodo Sanjaya, Yongky Sarli, Prasanti Widyasih Setio, Herlien Dwiarti