AbstractThis paper concerns the RNG based algebraic turbulence model. This model has characteristics to capture transitional process from laminar to turbulent flow. This is determined by the argument of the Heaviside function, which becomes a threshold for the occurrence of turbulence. It is supposed that proper modeling of this argument will lead to correctly capture transition location. In the present paper, this argument is modeled in such a way that the form of cubic equation for the turbulent kinematic viscosity be maintained. Moreover,...
Monday, August 22, 2011
Transfer of technology within the establishment of InaTEWS
Following the high magnitude earthquake that generated a gigantic tsunami in Aceh in 2004, the Indonesian government initiated work to develop the Indonesia Tsunami Early Warning System (InaTEWS). The work aimed to develop a system that would disseminate a warning within 5 minutes all over Indonesia. The State Ministry of Research and Technology (Ristek) developed the system in co-ordination with several institutions. InaTEWS, inaugurated on...
Evaluation of an RNG-based algebraic turbulence model
AbstractA new length scale and dissipation rate for a purely mathematically based algebraic turbulence model derived from renormalization group theory is proposed. The proposed length scale is developed in conjunction with an accurate characteristic length scale and the dissipation rate pertaining to the damping action due to the viscous force. In the fundamental aspect, this model is tested by applying it to a flat-plate problem to check that a simple shear layer is modeled adequately. As an application, a typical transonic flow around an airfoil...
Thursday, August 18, 2011
Hukum Tabur Tuai
Rekan-rekan semua, Setiap kali memperingati HUT Kemerdekaan, setiap kali saya tercenung pada lagu kebangsaan kita: BANGUNLAH JIWANYA, BANGUNLAH BADANNYA, UNTU INDONESIA RAYA. Ijinkan saya mengutip cerita di bawah, dari BBG. "HUKUM TABUR TUAI" Seorang CEO hendak mewariskan perusahaan besar kepada karyawan terbaiknya. Untuk itu ia memanggil seluruh karyawannya, memberikan masing² sebutir BENIH di tangannya dan berkata: "Sirami dengan teratur, rawat, dan kembalilah setahun dari sekarang dengan membawa tanaman yang tumbuh dari...
Tuesday, August 16, 2011
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