On the prediction of self-noise due to supercavitating underwater vehicle moving at subsonic speed using boundary element approach

Ramesh, Sai Sudha; Lim, Kian Meng; Khoo, Boo Cheong

doi:10.1121/1.4790328

Cited by 2 publications

(1 citation statement)

References 6 publications

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“…The numerical results showed that the angle of attack has little effect on the flow noise level of the vehicle while the angle ranges from 0 • to 4 • . The numerical studies about the flow noise of an underwater axisymmetric body in [25][26][27] were also under the condition of a constant stream velocity which comes from the axial direction.…”

Section: Introductionmentioning

confidence: 99%

The Flow Noise Calculation for an Axisymmetric Body in a Complex Underwater Environment

Huang

Yang

et al. 2019

JMSE

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The flow noise of a sonar platform is one of the main background interferences for sonar applications. This paper focuses on the flow noise of an axisymmetric body in a complex oceanic environment. Under the condition of a constant stream velocity which comes from the axial direction, an analytical method for computing the flow noise power spectrum in the transition region of the axisymmetric body is given in detail. The flow noise power spectrum computed by the analytical method is in agreement with the numerical simulation result. Then the flow noise physical features of the axisymmetric body in different incoming stream directions and velocity states caused by the complex oceanic environment are computed and analyzed by the numerical method. The results show that as the incoming stream direction changes, the transition region will migrate and the flow noise radiation direction of the axisymmetric body will also rotate at an angle which equals the stream direction variation. The flow noise energy generated by other directional incoming streams is slightly larger than that generated by the stream coming from an axial direction. When the incoming stream velocity is time-varying, the vorticity change on the axisymmetric body surface is obviously stronger than that under a constant stream, and the generated flow noise energy is also significantly larger. In addition, it indicates that there is a significant correlation between the intensity of flow noise energy and the magnitude of flow velocity.

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Section: Introductionmentioning

confidence: 99%

The Flow Noise Calculation for an Axisymmetric Body in a Complex Underwater Environment

Huang

Yang

et al. 2019

JMSE

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Numerical analysis of flow induced noise propagation in supercavitating vehicles at subsonic speeds

Ramesh

Lim

Zheng

et al. 2014

The Journal of the Acoustical Society of America

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Flow supercavitation begins when fluid is accelerated over a sharp edge, usually at the nose of an underwater vehicle, where phase change occurs and causes low density gaseous cavity to gradually envelop the whole object (supercavity) and thereby enabling higher speeds of underwater vehicles. The process of supercavity inception/development by means of "natural cavitation" and its sustainment through ventilated cavitation result in turbulence and fluctuations at the water-vapor interface that manifest themselves as major sources of hydrodynamic noise. Therefore in the present context, three main sources are investigated, namely, (1) flow generated noise due to turbulent pressure fluctuations around the supercavity, (2) small scale pressure fluctuations at the vapor-water interface, and (3) pressure fluctuations due to direct impingement of ventilated gas-jets on the supercavity wall. An understanding of their relative contributions toward self-noise is very crucial for the efficient operation of high frequency acoustic sensors that facilitate the vehicle's guidance system. Qualitative comparisons of acoustic pressure distribution resulting from aforementioned sound sources are presented by employing a recently developed boundary integral method. By using flow data from a specially developed unsteady computational fluid dynamics solver for simulating supercavitating flows, the boundary-element method based acoustic solver was developed for computing flow generated sound.

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On the prediction of self-noise due to supercavitating underwater vehicle moving at subsonic speed using boundary element approach

Cited by 2 publications

References 6 publications

The Flow Noise Calculation for an Axisymmetric Body in a Complex Underwater Environment

The Flow Noise Calculation for an Axisymmetric Body in a Complex Underwater Environment

Numerical analysis of flow induced noise propagation in supercavitating vehicles at subsonic speeds

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