Optimasi geometri baffle vertikal pada tangki lpg untuk mereduksi sloshing effect dan analisis kekuatan struktur

Adikara, Rifqi (2026) Optimasi geometri baffle vertikal pada tangki lpg untuk mereduksi sloshing effect dan analisis kekuatan struktur. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Fenomena sloshing merupakan pergerakan fluida di dalam tangki akibat adanya percepatan atau perlambatan kendaraan yang dapat mempengaruhi stabilitas kendaraan serta menimbulkan beban dinamis pada struktur tangki. Penelitian ini bertujuan untuk menganalisis pengaruh variasi geometri baffle terhadap kemampuan reduksi sloshing dan respons struktural pada tangki LPG menggunakan pendekatan numerik berbasis Computational Fluid Dynamics (CFD) dan Finite Element Analysis (FEA). Variasi geometri yang dianalisis meliputi baffle existing, Optional A, Optional B, dan corrugated. Simulasi CFD dilakukan menggunakan metode Volume of Fluid (VOF) dengan model turbulensi Standard k-ε untuk memodelkan interaksi dua fase fluida antara LPG cair dan udara pada kondisi pengereman (braking). Hasil simulasi CFD berupa gaya hidrodinamik yang selanjutnya digunakan sebagai import load pada analisis struktur menggunakan metode elemen hingga (Finite Element Method/FEM) untuk mengevaluasi distribusi tegangan dan deformasi pada masing-masing variasi baffle. Hasil simulasi menunjukkan bahwa variasi geometri baffle memberikan pengaruh signifikan terhadap karakteristik sloshing. Nilai peak force yang terjadi pada baffle existing menghasilkan gaya maksimum sebesar 9647N, OPT A sebesar 5045N, OPT B 7784N, lalu corrugated sebesar 8075N. Berdasarkan respon gaya terhadap waktu, OPT A menghasilkan peak force paling kecil disertai amplitudo osilasi fluida yang paling rendah dan stabil jika dibandingkan dengan baffle lainnya, sehingga hal tersebut menjadikan baffle yang paling terbaik dalam meredam sloshing. Sementara itu, hasil analisis struktur didapatkan nilai baffle existing menghasilkan gaya maksimum sebesar 18,857Mpa, OPT A sebesar 8,872Mpa, OPT B sebesar 11,53Mpa, lalu corrugated sebesar 6,2961Mpa. Dimana dari hal tersebut menandakan bahwa baffle corrugated memiliki gaya yang lebih kecil, sehingga hal tersebut menandakan bahwa baffle tersebut memiliki performa yang terbaik dalam segi struktur namun tidak dalam meredam sloshing nya. Selain itu, baffle corrugated juga memiliki massa struktur yang lebih ringan dibandingkan baffle lainnya. Hasil analisis struktural menunjukkan bahwa seluruh variasi baffle masih memiliki nilai tegangan maksimum di bawah batas luluh (yield strength) material sehingga struktur dinilai aman dalam menerima pembebanan dinamis akibat fenomena sloshing.
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Sloshing is the movement of liquid inside a tank caused by vehicle acceleration or deceleration, which can affect vehicle stability and generate dynamic loads on the tank structure. This study aims to investigate the influence of various baffle geometries on sloshing reduction and the structural response of an LPG tank using numerical approaches based on Computational Fluid Dynamics (CFD) and Finite Element Analysis (FEA). Four baffle configurations were evaluated, namely the existing baffle, Optional A, Optional B, and a corrugated baffle. The CFD simulation was performed using the Volume of Fluid (VOF) method with the Standard k-ε turbulence model to simulate the two-phase interaction between liquid LPG and air under braking conditions. The hydrodynamic loads obtained from the CFD simulation were subsequently imported into the structural analysis using the Finite Element Method (FEM) to evaluate the equivalent stress distribution and deformation of each baffle configuration. The simulation results indicate that the baffle geometry significantly affects the sloshing characteristics. The maximum peak force obtained for the existing baffle, Optional A, Optional B, and the corrugated baffle was 9,647 N, 5,045 N, 7,784 N, and 8,075 N, respectively. Based on the force-time response, Optional A produced the lowest peak force and exhibited the smallest and most stable oscillation amplitude, indicating the highest effectiveness in suppressing sloshing. Meanwhile, the structural analysis showed that the maximum equivalent stress for the existing baffle, Optional A, Optional B, and the corrugated baffle was 18.857 MPa, 8.872 MPa, 11.530 MPa, and 6.296 MPa, respectively. The corrugated baffle exhibited the lowest equivalent stress, indicating superior structural performance due to its ability to distribute dynamic loads more uniformly, although it did not provide the greatest reduction in sloshing. In addition, the corrugated baffle had the lowest structural mass among all configurations. Furthermore, the maximum equivalent stress of all baffle configurations remained below the material yield strength, indicating that all designs are structurally safe under dynamic loading induced by sloshing.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Kata kunci: Sloshing, CFD, FEA, Baffle, Tangki LPG, Corrugated Baffle, Fluida Dinamis Keywords: Sloshing, Computational Fluid Dynamics (CFD), Finite Element Analysis (FEA), Baffle, LPG Tank, Corrugated Baffle, Dynamic Fluid.
Subjects:	T Technology > T Technology (General) > T57.62 Simulation T Technology > TA Engineering (General). Civil engineering (General) > TA347 Finite Element Method T Technology > TA Engineering (General). Civil engineering (General) > TA357 Computational fluid dynamics. Fluid Mechanics T Technology > TA Engineering (General). Civil engineering (General) > TA357.5.S57 Sloshing T Technology > TA Engineering (General). Civil engineering (General) > TA645 Structural analysis (Engineering)
Divisions:	Faculty of Vocational > Mechanical Industrial Engineering (D4)
Depositing User:	Rifqi Adikara
Date Deposited:	01 Jul 2026 09:06
Last Modified:	01 Jul 2026 09:06
URI:	http://repository.its.ac.id/id/eprint/134190

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