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| − | ==1 Title, abstract and keywords== | + | ==Abstract== |
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| − | Your document should start with a concise and informative title. Titles are often used in information-retrieval systems. Avoid abbreviations and formulae where possible. Capitalize the first word of the title.
| + | There are a series of marine operations and/or navigation conditions where internal flows in tanks can affect the seakeeping behaviour of a vessel. This coupled effect must be assessed as it can be extremely important when estimating the viability of certain operations or the risks associated to specific load conditions during navigation. These operations and/or navigation conditions can be crucial in some sectors of the maritime industry where fluid-dynamic effects can improve the global dynamic response, such as anti-roll tanks used in the oil&gas industry, or can prove to be a big problem when, for example, sloshing effects appears in the transport of Liquefied Natural Gas (LNG). |
| | + | This presentation has two main parts. First, the recent work of the MARINE group of CIMNE in the development and application of seakeeping analysis tools will be presented. Here, we will introduce SeaFEM (see http://www.compassis.com/seafem), a second-order diffraction-radiation solver for multi-body seakeeping problems based on the Finite Element Method [1, 2]. Then, we will focus on the development and application of solutions for the coupled analysis of seakeeping problems considering internal flows in tanks, and in particular the sloshing phenomena. To estimate these critical effects, two different solvers are integrated into one coupled tool using an effective coupling algorithm and a communication technique that allows simulations to be computed without affecting the global compute time and the accuracy of the solvers. Two different approaches have been implemented and validated: |
| | + | a) The internal flow part of the coupled problem is solved using the Smoothed Particle Hydrodynamics Method [3] (SPH) using the AQUAgpusph code developed at CEHINAV. While the interaction between waves and the floating body is solved using SeaFEM. |
| | + | b) The fluid dynamics part of the coupled problem is solved using the Particle Finite Element Method [4, 5] known as PFEM-2 that incorporates the X-IVAS scheme and the seakeeping problem is again solved using SeaFEM. |
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| − | Provide a maximum of 6 keywords, and avoiding general and plural terms and multiple concepts (avoid, for example, 'and', 'of'). Be sparing with abbreviations: only abbreviations firmly established in the field should be used. These keywords will be used for indexing purposes.
| + | ==PRESENTATION== |
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| − | An abstract is required for every document; it should succinctly summarize the reason for the work, the main findings, and the conclusions of the study. Abstract is often presented separately from the article, so it must be able to stand alone. For this reason, references and hyperlinks should be avoided. If references are essential, then cite the author(s) and year(s). Also, non-standard or uncommon abbreviations should be avoided, but if essential they must be defined at their first mention in the abstract itself.
| + | <pdf>Media:Draft_Guides_421479357_6750_PDF_MARINE_2017.pdf</pdf> |
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| − | ==2 The main text== | + | ==References== |
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| − | You can enter and format the text of this document by selecting the ‘Edit’ option in the menu at the top of this frame or next to the title of every section of the document. This will give access to the visual editor. Alternatively, you can edit the source of this document (Wiki markup format) by selecting the ‘Edit source’ option.
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| − | Most of the documents in Scipedia are written in English (write your manuscript in American or British English, but not a mixture of these). Anyhow, specific publications in other languages can be published in Scipedia. In any case, the documents published in other languages must have an abstract written in English.
| + | [1] Serván-Camas, B., García-Espinosa, J. “Accelerated 3D multi-body seakeeping simulations using unstructured finite elements”. Journal of Computational Physics, vol. 252, pp. 382-403, Nov. 2013. |
| | + | [2] Serván-Camas, B., “A time-domain finite element method for seakeeping and wave resistance problems”. PhD thesis. Universidad Politécnica de Madrid (2016). |
| | + | [3] B. Servan Camas, J. Cercós-Pita, J. Colom Cobb, J. García-Espinosa and A. Souto-Iglesias, "Time domain simulation of coupled sloshing–seakeeping problems by SPH–FEM coupling", Ocean Engineering, 123, (2016), 383–396. URL: www.scipedia.com/public/Servan_Camas_et_al__2016a |
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| − | ===2.1 Subsections===
| + | [4] Idelsohn, S.R., Oñate, E. Del Pin, F. “The particle finite element method: a powerful tool to solve incompressible flows with free‐surfaces and breaking waves”. International journal for numerical methods in engineering, vol. 61-7, pp. 964-989, Oct. 2004. |
| − | | + | [5] Idelsohn, S.R., Nigro, N., Limache, A., Oñate, E. “Large time-step explicit integration method for solving problems with dominant convection”. Computer Methods in Applied Mechanics and Engineering, vol. 217–220, pp. 168–185, Apr. 2012. |
| − | Divide your article into clearly defined and numbered sections. Subsections should be numbered 1.1, 1.2, etc. and then 1.1.1, 1.1.2, ... Use this numbering also for internal cross-referencing: do not just refer to 'the text'. Any subsection may be given a brief heading. Capitalize the first word of the headings.
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| − | ===2.2 General guidelines===
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| − | :* Follow internationally accepted rules and conventions. In particular use the international system of units (SI). If other quantities are mentioned, give their equivalent in SI.
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| − | ===2.3 Tables, figures, lists and equations===
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| − | Please insert tables as editable text and not as images. Tables should be placed next to the relevant text in the article. Number tables consecutively in accordance with their appearance in the text (<span id='cite-_Ref382560620'></span>[[#_Ref382560620|table 1]], table 2, etc.) and place any table notes below the table body. Be sparing in the use of tables and ensure that the data presented in them do not duplicate results described elsewhere in the article.
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| − | <span id='_Ref382560620'></span>
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| − | {| style="margin: 1em auto 1em auto;border: 1pt solid black;border-collapse: collapse;"
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| − | | style="text-align: center;"|Thickness
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| − | | style="text-align: center;"|3.175 mm
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| − | | style="text-align: center;"|Young Modulus
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| − | | style="text-align: center;"|12.74 MPa
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| − | | style="text-align: center;"|Poisson coefficient
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| − | | style="text-align: center;"|0.25
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| − | | style="text-align: center;"|Density
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| − | | style="text-align: center;"|1107 kg/m<sup>3</sup>
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| − | |}
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| − | <div class="center" style="width: auto; margin-left: auto; margin-right: auto;">
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| − | <span style="text-align: center; font-size: 75%;">Table 1: Material properties</span></div>
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| − | [[Image:Scipedia.gif|center|480px]]
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| − | <div class="center" style="width: auto; margin-left: auto; margin-right: auto;">
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| − | <span style="text-align: center; font-size: 75%;">Figure 1. Scipedia logo.</span></div>
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| − | Number the figures according to their sequence in the text (<span id='cite-_Ref448852946'></span>[[#_Ref448852946|figure 1]], figure 2, etc.). Ensure that each illustration has a caption. A caption should comprise a brief title. Keep text in the illustrations themselves to a minimum but explain all symbols and abbreviations used. Try to keep the resolution of the figures to a minimum of 300 dpi. If a finer resolution is required, the figure can be inserted as supplementary material
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| − | For tabular summations that do not deserve to be presented as a table, lists are often used. Lists may be either numbered or bulleted. Below you see examples of both.
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| − | 1. The first entry in this list
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| − | 2. The second entry
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| − | 2.1. A subentry
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| − | 3. The last entry
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| − | * Another one
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| − | You may choose to number equations for easy referencing. In that case they must be numbered consecutively with Arabic numerals in parentheses on the right hand side of the page. Below is an example of formulae that should be referenced as eq. <span id='cite-_Ref424030152'></span>[[#_Ref424030152|(1)]].
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| − | | style="vertical-align: top;"| <math>{\nabla }^{2}\phi =0</math>
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| − | | style="text-align: right;"|<span id='_Ref424030152'></span>
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| − | (1)
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| − | ===2.4 Supplementary material===
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| − | Supplementary material can be inserted to support and enhance your article. This includes video material, animation sequences, background datasets, computational models, sound clips and more. In order to ensure that your material is directly usable, please provide the files with a preferred maximum size of 50 MB. Please supply a concise and descriptive caption for each file.
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| − | ==3 Bibliography==
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| − | Citations in text will follow a citation-sequence system (i.e. sources are numbered by order of reference so that the first reference cited in the document is [<span id='cite-1'></span>[[#1|1]]], the second [<span id='cite-2'></span>[[#2|2]]], and so on) with the number of the reference in square brackets. Once a source has been cited, the same number is used in all subsequent references. If the numbers are not in a continuous sequence, use commas (with no spaces) between numbers. If you have more than two numbers in a continuous sequence, use the first and last number of the sequence joined by a hyphen (e.g. [<span id='cite-1'></span>[[#1|1]], <span id='cite-3'></span>[[#3|3]]] or [<span id='cite-2'></span>[[#2|2]]-<span id='cite-2'></span>[[#4|4]]]).
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| − | ==4 Acknowledgments==
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| − | Acknowledgments should be inserted at the end of the document, before the references section.
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| − | ==5 References==
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| − | [[#cite-1|[1]]] Author, A. and Author, B. (Year) Title of the article. Title of the Publication. Article code. Available: [http://www.scipedia.com/ucode. http://www.scipedia.com/ucode.]
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| − | [[#cite-2|[2]]] Author, A. and Author, B. (Year) Title of the article. Title of the Publication. Volume number, first page-last page.
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| − | [[#cite-4|[4]]] Author of Part, D. (Year). Title of chapter or part. In A. Editor & B. Editor (Eds.), Title: Subtitle of book (edition, inclusive page numbers). Place of publication: Publisher.
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| − | <div id="5"></div>
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| − | [[#cite-5|[5]]] Author, E. (Year, Month date). Title of the article. In A. Editor, B. Editor, and C. Editor. Title of published proceedings. Paper presented at title of conference, Volume number, first page-last page. Place of publication.
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There are a series of marine operations and/or navigation conditions where internal flows in tanks can affect the seakeeping behaviour of a vessel. This coupled effect must be assessed as it can be extremely important when estimating the viability of certain operations or the risks associated to specific load conditions during navigation. These operations and/or navigation conditions can be crucial in some sectors of the maritime industry where fluid-dynamic effects can improve the global dynamic response, such as anti-roll tanks used in the oil&gas industry, or can prove to be a big problem when, for example, sloshing effects appears in the transport of Liquefied Natural Gas (LNG).
This presentation has two main parts. First, the recent work of the MARINE group of CIMNE in the development and application of seakeeping analysis tools will be presented. Here, we will introduce SeaFEM (see http://www.compassis.com/seafem), a second-order diffraction-radiation solver for multi-body seakeeping problems based on the Finite Element Method [1, 2]. Then, we will focus on the development and application of solutions for the coupled analysis of seakeeping problems considering internal flows in tanks, and in particular the sloshing phenomena. To estimate these critical effects, two different solvers are integrated into one coupled tool using an effective coupling algorithm and a communication technique that allows simulations to be computed without affecting the global compute time and the accuracy of the solvers. Two different approaches have been implemented and validated:
a) The internal flow part of the coupled problem is solved using the Smoothed Particle Hydrodynamics Method [3] (SPH) using the AQUAgpusph code developed at CEHINAV. While the interaction between waves and the floating body is solved using SeaFEM.
b) The fluid dynamics part of the coupled problem is solved using the Particle Finite Element Method [4, 5] known as PFEM-2 that incorporates the X-IVAS scheme and the seakeeping problem is again solved using SeaFEM.
[1] Serván-Camas, B., García-Espinosa, J. “Accelerated 3D multi-body seakeeping simulations using unstructured finite elements”. Journal of Computational Physics, vol. 252, pp. 382-403, Nov. 2013.
[2] Serván-Camas, B., “A time-domain finite element method for seakeeping and wave resistance problems”. PhD thesis. Universidad Politécnica de Madrid (2016).
[3] B. Servan Camas, J. Cercós-Pita, J. Colom Cobb, J. García-Espinosa and A. Souto-Iglesias, "Time domain simulation of coupled sloshing–seakeeping problems by SPH–FEM coupling", Ocean Engineering, 123, (2016), 383–396. URL: www.scipedia.com/public/Servan_Camas_et_al__2016a
[4] Idelsohn, S.R., Oñate, E. Del Pin, F. “The particle finite element method: a powerful tool to solve incompressible flows with free‐surfaces and breaking waves”. International journal for numerical methods in engineering, vol. 61-7, pp. 964-989, Oct. 2004.
[5] Idelsohn, S.R., Nigro, N., Limache, A., Oñate, E. “Large time-step explicit integration method for solving problems with dominant convection”. Computer Methods in Applied Mechanics and Engineering, vol. 217–220, pp. 168–185, Apr. 2012.
