Comparison and Evaluation of Open-Source Panel Method Codes against Commercial Codes

Abstract

This work provides a benchmark study regarding the open-source panel method codes of two floating wind turbine platforms. HAMS, NEMOH, and WAMIT are compared in terms of their results, computational performance, user-friendliness, and, flexibility. WAMIT’s data is sourced from previous publications for the OC3 Hywind Spar and OC4 DeepCWind Semisubmersible. These reference values are compared to NEMOH and HAMS for the main parameters representing the movement of the structure: wave excitation forces, added mass values, and potential damping. Both of the open source panel method codes were quite successful in the concept of a simple one-piece spar float rather than a multibody semi-submersible in terms of NRMS values. Overall, the most close results were obtained from the surge for added mass, and the most unfavorable results were from radiation damping in the heave. NEMOH brings ineligible results for pitch on both platforms. Neglecting the pitch axis results of NEMOH, both codes showed parallel and reasonably close results to WAMIT. The study aims to help researchers to choose a free open-source alternative to a validated commercial code.

Keywords

• : Panel Method
• hydrodynamic coefficients
• open-source
• BEM solver
• benchmark study
• offshore wind

Açık Kaynaklı Panel Yöntemi Kodlarının Ticari Kod ile Karşılaştırılması ve Değerlendirilmesi

Öz

Bu çalışmada, iki yüzer rüzgâr türbini platformu üzerinden açık kaynaklı panel yöntemi kodlarına dair bir kıyaslama çalışması sunulmuştur. HAMS, NEMOH ve WAMIT; sonuçları, hesaplama performansları, kullanım kolaylıkları ve esneklikleri açısından karşılaştırılmıştır. OC3 Hywind Spar ve OC4 DeepCWind Semisubmersible yüzer platformları için WAMIT verileri önceki yayınlardan alınmış olup yapının hareketini temsil eden şu ana parametreler NEMOH ve HAMS değerleri ile karşılaştırılmıştır: yapıya etkiyen dalga kuvvetleri, katma kütle değerleri ve potansiyel sönüm değerleri. Her iki açık kaynak panel yöntemi kodu da, NRMS değerleri baz alınarak, çok elemanlı olan Semisubmersible platformdan ziyade, basit bir tek parça spar platform konseptinde daha başarılı olmuştur. Genel olarak, en yakın sonuçlar, katma kütle için ileri-geri öteleme yönünden; en olumsuz sonuçlar ise, dalıp-çıkma yönündeki radyasyon sönümlenmesinden elde edilmiştir. NEMOH, her iki platformda da baş-kıç vurmada uygun bulunamayacak sonuçlar vermiştir. NEMOH'un bu baş-kıç vurma sonuçları ihmal edilirse, her iki kod da WAMIT'e paralel ve makul derecede yakın sonuçlar vermiştir. Bu çalışmanın amacı, geçerliliği kabul edilmiş bir ticari koda alternatif olarak, araştırmacıların ücretsiz bir açık kaynak kodu seçebilmelerine yardımcı olmaktır.

Anahtar Kelimeler

• Panel Metotu
• hidrodinamik katsayılar
• açık kaynak
• BEM çözücü
• kıyaslama çalışması
• açık deniz rüzgarı

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