Analisis Pengaruh Penambahan Spray Strips pada Stepped Planing Hull terhadap Hambatan Total menggunakan Metode Computational Fluid Dynamics

*Febriyansyah Eko Ardhi Nugroho  -  Departemen Teknik Perkapalan, Fakultas Teknik, Universitas Diponegoro, Indonesia
Untung Budiarto  -  Departemen Teknik Perkapalan, Fakultas Teknik, Universitas Diponegoro, Indonesia
Ari Wibawa Budi Santosa  -  Departemen Teknik Perkapalan, Fakultas Teknik, Universitas Diponegoro, Indonesia

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Abstract

Kapal tipe planing hull menghasilkan tekanan hidrodinamika yang besar ketika sedang melaju dalam kecepatan tinggi. Meningkatkan kecepatan kapal menjadi salah satu aspek penting dari desain planing hull. Pada penelitian ini menggunakan spray strips untuk mengurangi hambatan yang dihasilkan kapal planing hull. Spray strips ini berfungsi untuk mengurangi Wetted Surface Area (WSA), terutama pada area semprotan. Cara kerjanya dengan membelokkan arah aliran semprotan yang terdapat di depan garis stagnasi. Penelitian ini menggunakan model double stepped hull dan variasi besar bottom angle (δ) pada spray strips, serta kecepatan kapal. Metode yang digunakan dalam penelitian ini yaitu Finite Volume Method (FVM) dengan persamaan Reynolds-Averaged Navier-Stokes (RANS). Model turbulensi yang digunakan k-ω SST dan untuk merepresentasikan fase air dan udara menggunakan Volume of Fluid (VOF). Hasil dari penelitian ini menunjukkan penambahan spray strips secara keseluruhan dapat mengurangi hambatan total di semua kecepatan. Semakin besar bottom angle (δ) maka semakin kecil hambatan total yang dihasilkan. Dengan pengurangan terbesar 14.96% pada variasi besar sudut 60° (SS 5) di Fn 1.41. Sedangkan, penurunan hambatan total terkecil sebesar 2.8% di Fn 2.07 pada variasi besar sudut 15° (SS 2). Berdasarkan rata-rata pengurangan hambatan total di semua kecepatan, variasi SS 5 menunjukkan hasil terbaik.

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Keywords: planing hull; hambatan; spray strips; CFD
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Section: Articles
Language : EN
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