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Activity title

Flowfield prediction for manoeuvring underwater vehicles

Activity Reference

AVT-301

Panel

Applied Vehicle Technology

Security Classification

NATO UNCLASSIFIED

Status

Active

Activity type

RTG

Start date

2018

End date

2020

Keywords

CFD, performance, Submarine manoeuvring

Background

Physical testing of fully-submerged vehicles is both complex and highly expensive, particularly at larger model scales; CFD methods have, therefore, long been used to investigate and understand simpler, steady-state hydrodynamic problems. However, advances in CFD methodology and computational power mean that simulation of more challenging, transient flows is now possible. Several recent AVT RTGs have shown the potential of such approaches and generated a huge amount of data and understanding, but many questions remain unanswered.

Objectives

Assess the ability, maturity and applicability of state-of-the art viscous flow solvers to predict the hydrodynamic performance of a manoeuvring submarine at straight flight, steady drift and during a constant-rate manoeuver. The use of a single baseline geometry and a limited number of test cases is intended to allow a thorough understanding of the fluid dynamic processes to be achieved and a high degree of information and results interchange and collaborative working between partners.

Topics

• The use of high fidelity CFD methods for the prediction of the flow around a submarine at straight flight, at a steady drift angle and at steady rotation; • Validation and assessment of computational predictions through comparison with experimentally-derived flow field measurements and force and moment data.

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