An Investigation on the Discrepancies between RANS and BEM Approaches for the Prediction of Marine Propeller Unsteady Performances in Strongly Non-Homogeneous Wakes
In the present work an analysis of the reliability of different numerical approaches, namely BEM and RANSE solver, for the prediction of unsteady performances of marine propellers is presented. To this aim, the well-known Seiun-Maru Highly Skewed Propeller operating in different wakes is considered....
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ftunivgenova:oai:iris.unige.it:11567/732580 2024-04-14T08:05:03+00:00 An Investigation on the Discrepancies between RANS and BEM Approaches for the Prediction of Marine Propeller Unsteady Performances in Strongly Non-Homogeneous Wakes GAGGERO, STEFANO VILLA, DIEGO VIVIANI, MICHELE Gaggero, Stefano Villa, Diego Viviani, Michele 2014 ELETTRONICO https://hdl.handle.net/11567/732580 https://doi.org/10.1115/OMAE2014-23831 eng eng American Society of Mechanical Engineers (ASME) country:USA info:eu-repo/semantics/altIdentifier/isbn/9780791845400 info:eu-repo/semantics/altIdentifier/wos/WOS:000363492700048 ispartofbook:Proceedings of the ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering (OMAE 2014) International Conference on Ocean, Offshore and Arctic Engineering (OMAE 2014) firstpage:1 lastpage:12 numberofpages:12 https://hdl.handle.net/11567/732580 doi:10.1115/OMAE2014-23831 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84911932343 Ship propulsion Propeller cavitation Computational Fluid Dynamics (CFD) info:eu-repo/semantics/conferenceObject 2014 ftunivgenova https://doi.org/10.1115/OMAE2014-23831 2024-03-21T02:24:24Z In the present work an analysis of the reliability of different numerical approaches, namely BEM and RANSE solver, for the prediction of unsteady performances of marine propellers is presented. To this aim, the well-known Seiun-Maru Highly Skewed Propeller operating in different wakes is considered. The results of this analysis show that, in correspondence to particularly challenging conditions, i.e. when very pronounced ship wakes are present, the two approaches may provide considerably different results in terms of propeller mechanical characteristics and pressure distributions on the blades. This problem, which is implicitly eliminated when the thrust identity approach is applied (as almost always performed, as an example, for propeller analyses aimed to the evaluation of cavitation extension and / or induced pressures), may become critical in case the codes are used for numerical self-propulsion tests, where a high accuracy in the prediction of the unsteady propeller performances in correspondence to a prescribed value of the advance coefficient, instead of the thrust coefficient, is mandatory. The analyses carried out allow to underline which are the potentially more problematic cases, in terms of wakes characteristics, and to suggest some possible reasons of the encountered discrepancies, which will need further analyses to enhance the prediction capability of numerical codes. Conference Object Arctic Università degli Studi di Genova: CINECA IRIS Volume 2: CFD and VIV |
institution |
Open Polar |
collection |
Università degli Studi di Genova: CINECA IRIS |
op_collection_id |
ftunivgenova |
language |
English |
topic |
Ship propulsion Propeller cavitation Computational Fluid Dynamics (CFD) |
spellingShingle |
Ship propulsion Propeller cavitation Computational Fluid Dynamics (CFD) GAGGERO, STEFANO VILLA, DIEGO VIVIANI, MICHELE An Investigation on the Discrepancies between RANS and BEM Approaches for the Prediction of Marine Propeller Unsteady Performances in Strongly Non-Homogeneous Wakes |
topic_facet |
Ship propulsion Propeller cavitation Computational Fluid Dynamics (CFD) |
description |
In the present work an analysis of the reliability of different numerical approaches, namely BEM and RANSE solver, for the prediction of unsteady performances of marine propellers is presented. To this aim, the well-known Seiun-Maru Highly Skewed Propeller operating in different wakes is considered. The results of this analysis show that, in correspondence to particularly challenging conditions, i.e. when very pronounced ship wakes are present, the two approaches may provide considerably different results in terms of propeller mechanical characteristics and pressure distributions on the blades. This problem, which is implicitly eliminated when the thrust identity approach is applied (as almost always performed, as an example, for propeller analyses aimed to the evaluation of cavitation extension and / or induced pressures), may become critical in case the codes are used for numerical self-propulsion tests, where a high accuracy in the prediction of the unsteady propeller performances in correspondence to a prescribed value of the advance coefficient, instead of the thrust coefficient, is mandatory. The analyses carried out allow to underline which are the potentially more problematic cases, in terms of wakes characteristics, and to suggest some possible reasons of the encountered discrepancies, which will need further analyses to enhance the prediction capability of numerical codes. |
author2 |
Gaggero, Stefano Villa, Diego Viviani, Michele |
format |
Conference Object |
author |
GAGGERO, STEFANO VILLA, DIEGO VIVIANI, MICHELE |
author_facet |
GAGGERO, STEFANO VILLA, DIEGO VIVIANI, MICHELE |
author_sort |
GAGGERO, STEFANO |
title |
An Investigation on the Discrepancies between RANS and BEM Approaches for the Prediction of Marine Propeller Unsteady Performances in Strongly Non-Homogeneous Wakes |
title_short |
An Investigation on the Discrepancies between RANS and BEM Approaches for the Prediction of Marine Propeller Unsteady Performances in Strongly Non-Homogeneous Wakes |
title_full |
An Investigation on the Discrepancies between RANS and BEM Approaches for the Prediction of Marine Propeller Unsteady Performances in Strongly Non-Homogeneous Wakes |
title_fullStr |
An Investigation on the Discrepancies between RANS and BEM Approaches for the Prediction of Marine Propeller Unsteady Performances in Strongly Non-Homogeneous Wakes |
title_full_unstemmed |
An Investigation on the Discrepancies between RANS and BEM Approaches for the Prediction of Marine Propeller Unsteady Performances in Strongly Non-Homogeneous Wakes |
title_sort |
investigation on the discrepancies between rans and bem approaches for the prediction of marine propeller unsteady performances in strongly non-homogeneous wakes |
publisher |
American Society of Mechanical Engineers (ASME) |
publishDate |
2014 |
url |
https://hdl.handle.net/11567/732580 https://doi.org/10.1115/OMAE2014-23831 |
genre |
Arctic |
genre_facet |
Arctic |
op_relation |
info:eu-repo/semantics/altIdentifier/isbn/9780791845400 info:eu-repo/semantics/altIdentifier/wos/WOS:000363492700048 ispartofbook:Proceedings of the ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering (OMAE 2014) International Conference on Ocean, Offshore and Arctic Engineering (OMAE 2014) firstpage:1 lastpage:12 numberofpages:12 https://hdl.handle.net/11567/732580 doi:10.1115/OMAE2014-23831 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84911932343 |
op_doi |
https://doi.org/10.1115/OMAE2014-23831 |
container_title |
Volume 2: CFD and VIV |
_version_ |
1796301922190229504 |