scholarly journals Development of the Flight Dynamic Model (FDM) Using Computational Fluid Dynamic (CFD) Simulations for an Unknown Aircraft

2020 ◽  
Author(s):  
Adil Loya ◽  
Shoaib Arif ◽  
Muhammad Arsalan ◽  
Siraj Anis ◽  
Arsalan Khan ◽  
...  
Keyword(s):  
Dynamic Model ◽  
Computational Fluid Dynamic ◽  
Fluid Dynamic ◽  
Cfd Simulations

scholarly journals Pengaruh Kekasaran Permukaan terhadap Performa Slider Bearing Bertekstur dengan Menggunakan Pendekatan CFD

ROTASI ◽  
2019 ◽  
Vol 21 (1) ◽  
pp. 56
Author(s):  
Mohammad Tauviqirrahman ◽  
Mufti M. Suryaman ◽  
Muchammad Muchammad
Keyword(s):  
Dynamic Model ◽  
Computational Fluid Dynamic ◽  
Fluid Dynamic ◽  
Computational Fluid Dynamic Model ◽  
Slider Bearing ◽  
Multi Phase

Dalam teori pelumasan klasik hidrodinamika, asumsi permukaan kontak bearing yang benar-benar halus sering kali digunakan. Meskipun demikian, telah dibuktikan bahwa asumsi tersebut tidak realistis dikarenakan pada umumnya, tidak ada permukaan bearing yang benar-benar halus. Tulisan ini membahas pengaruh kekasaran permukaan terhadap performa slider bearing bertektur dengan menggunakan pendekatan CFD (computational fluid dynamic). Model kavitasi multi-phase digunakan untuk memodelkan fenomena kavitasi yang lebih riil. Performa slider bearing dengan tingkat kekasaran permukaan tertentu dibandingkan dengan slider bearing halus dengan menvariasikan kondisi inersia. Berdasarkan hasil simulasi, ditemukan bahwa tekanan hidrodinamik dan daya dukung beban berkurang dengan bertambahnya kekasaran permukaan. Selain itu, jika bearing dirancang agar memiliki kondisi inersia yang rendah, daya dukung beban akan menjadi lebih besar.

Smoke Simulation in an Underground Train Station Using Computational Fluid Dynamic

2014 ◽  
Vol 663 ◽  
pp. 366-372 ◽  
Author(s):  
Zambri Harun ◽  
Muhammad Saiful bin Sahari ◽  
Taib Iskandar Mohamad
Keyword(s):  
Computational Fluid Dynamic ◽  
Fire Safety ◽  
Fluid Dynamic ◽  
Fire Department ◽  
Cfd Simulations ◽  
Train Station ◽  
Hazardous Gases ◽  
Design Software ◽  
Underground Station ◽  
Safety Systems

The design of the ventilation and fire safety systems for the Johor Bahru Sentral, a semi-underground train station, part of the Integrated Custom, Immigration and Quarantine Complex (ICIQ) is based on normal Malaysian Standards (MS), British Standards and the local fire department’s requirements. However, the large and complex space in the underground station coupled with scheduled diesel-powered locomotives which frequent the station by stopping or passing require detailed simulations. Both ventilation and the fire safety systems employ Computational Fluid Dynamic (CFD) methods to provide realistic balance against the typical calculations based on spread sheets and certain design software. This study compares smoke simulations results performed by the mechanical and fire consultants with the simulations carried out through this project. An assumption of a locomotive catches fire near the main platform is made. The burning locomotive is the source of the smoke while the occupants on platforms and waiting areas are the subjects to escape safely. The process of the simulation includes modelling and meshing processes on the structure of the railway station imported from Inventor CAD Autodesk software drawing. The CFD simulations are performed using Star-CCM+. The smokes flow around the building with buoyancy forces and extracted via exhaust fans. Through these simulations, we found that when a locomotive catches fire, the passengers could evacuate the building safely before the fire department machinery arrives. Furthermore, we notice that the ventilation fans activation based on detection of hazardous gases may not be efficient way to remove the latter. A schedule clean-up sync with train arrivals effectively removes toxic gas.

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