{"id":974,"date":"2012-09-03T04:07:33","date_gmt":"2012-09-03T04:07:33","guid":{"rendered":"\/?page_id=974"},"modified":"2024-12-13T10:08:11","modified_gmt":"2024-12-13T09:08:11","slug":"marine-applications","status":"publish","type":"page","link":"https:\/\/www.lemma-ing.com\/?page_id=974","title":{"rendered":"Marine applications"},"content":{"rendered":"<div class=\"su-accordion su-u-trim\">\n<div class=\"su-spoiler su-spoiler-style-fancy su-spoiler-icon-plus su-spoiler-closed\" data-scroll-offset=\"0\" data-anchor-in-url=\"no\"><div class=\"su-spoiler-title\" tabindex=\"0\" role=\"button\"><span class=\"su-spoiler-icon\"><\/span>Numerical basin technology<\/div><div class=\"su-spoiler-content su-u-clearfix su-u-trim\">\n<p style=\"text-align: justify;\">In a high competitive industrial context, the experimental tests, even at reduced scale, are costly and time consuming for a project : breadboards realization, tests equipment availability, tests duration and results analysis. Willing to provide efficient innovating solutions within a cost reduction approach, LEMMA has developed the numerical basin concept with its combined expertise in numerical simulation and hydrodynamics.<br \/>\nLEMMA has developed new numerical methods, faster and more accurate, implemented with parallel algorithms in the CFD software <a title=\"NICEFLOW\u00ae : The ultimate strongly coupled CFSD solver\" href=\"\/?page_id=2923\"><strong>NICEFLOW\u00ae<\/strong><\/a>, which simulates the real turbulent flow of vessels behavior or oil platforms (floating structures).<br \/>\nThe numerical performances of the numerical basin enable to seize the reality of physical phenomenon at scale 1. We now are able to:<\/p>\n<ul>\n<li>Generate <strong>any type of wave<\/strong> : monochromatic, bi-chromatic, regular wave, regular wave packet, irregular waves, within any number of oscillating flaps or spectral methods. Linear or non linear approach considered to generate waves is coupled to LES-VMS models and allows us to perform very accurate simulations, up to order 6 in space (see example below untitled <a title=\"Featured technology: high order numerical methods\" href=\"\/?page_id=1285\">Numerical investigation of thermally stratified wake<\/a>).<\/li>\n<li>Take into account <strong>current and wind<\/strong> without velocity limitation.<\/li>\n<li>Modeling <strong>anchors<\/strong> (linear and non linear) linked to floating bodies.<\/li>\n<li>Study <strong>sea-keeping<\/strong> and maneuverability.<\/li>\n<\/ul>\n<div class=\"su-row\">\n<div class=\"su-column su-column-size-1-2\"><div class=\"su-column-inner su-u-clearfix su-u-trim\">\n<p style=\"text-align: center;\">\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-3243 aligncenter\" src=\"https:\/\/www.lemma-ing.com\/wp-content\/uploads\/UX105_Growth_Room_2-300x165.png\" alt=\"\" width=\"300\" height=\"165\" srcset=\"https:\/\/www.lemma-ing.com\/wp-content\/uploads\/UX105_Growth_Room_2-300x165.png 300w, https:\/\/www.lemma-ing.com\/wp-content\/uploads\/UX105_Growth_Room_2-1024x564.png 1024w, https:\/\/www.lemma-ing.com\/wp-content\/uploads\/UX105_Growth_Room_2-768x423.png 768w, https:\/\/www.lemma-ing.com\/wp-content\/uploads\/UX105_Growth_Room_2-1536x846.png 1536w, https:\/\/www.lemma-ing.com\/wp-content\/uploads\/UX105_Growth_Room_2-2048x1128.png 2048w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/p>\n<p><center><strong>Numerical basin: simulation example<br \/>\n<\/strong><\/center><\/div><\/div>\n<div class=\"su-column su-column-size-1-2\"><div class=\"su-column-inner su-u-clearfix su-u-trim\">\n<p><img decoding=\"async\" class=\"aligncenter\" src=\"\/wp-content\/uploads\/Marine-DTBM.png\" width=\"500\" \/><\/p>\n<p><center><strong>Numerical basin : wave and\/or current generation.<\/strong><\/center><\/div><\/div>\n<\/div>\n<p>To see further details on this subject, please follow this <a href=\"\/?page_id=2900\">link<\/a>.<\/p>\n<\/div><\/div>\n<div class=\"su-spoiler su-spoiler-style-fancy su-spoiler-icon-plus su-spoiler-closed\" data-scroll-offset=\"0\" data-anchor-in-url=\"no\"><div class=\"su-spoiler-title\" tabindex=\"0\" role=\"button\"><span class=\"su-spoiler-icon\"><\/span>Academic numerical validation examples<\/div><div class=\"su-spoiler-content su-u-clearfix su-u-trim\">\n<ul>\n<li><strong>NACA profile in water<\/strong><\/li>\n<\/ul>\n<p style=\"text-align: justify;\">Several experimental studies have been completed in the IIHR\u2014Hydroscience &amp; Engineering towing tank. We reproduced NACA \u00a0experiments to perform validation studies. Below are briefly presented the results.<\/p>\n<p><img decoding=\"async\" class=\"aligncenter\" src=\"\/wp-content\/uploads\/Marine-NACA.png\" width=\"500\" \/><\/p>\n<p><center><strong>NACA, Fr=0.19. Top left : free surface elevation (towing tank). Top right : iso surface simulated. Bottom left : 3D mesh. Bottom right : calculated free surface elevation.<\/strong><\/center><\/p>\n<ul>\n<li><strong>Edge impacting free surface<\/strong><\/li>\n<\/ul>\n<p style=\"text-align: justify;\">Initially, the wedge is falling under the gravity and, after the impact, its motion results from its interaction with the water. For this simulation, the geometric mesh adaptation strategy has been applied. A sequence of three quasi embedded meshes containing respectively 3 069, 10 432 and 37 146 vertices has been generated. They correspond to a division by two of spatial step size. This sequence will enable us to study the convergence of the method. During the simulation, when the mesh becomes too distorted due to the displacement of the wedge, the adapted mesh is regenerated with the same geometric and size criteria. CPU time = 6 hours on 1 processor. For further details, see the publication [<a title=\"Bibliographical ressources\" href=\"\/?page_id=69\">Allain &amp; al., OMAE 2009<\/a>]\n<div class=\"su-row\">\n<div class=\"su-column su-column-size-1-2\"><div class=\"su-column-inner su-u-clearfix su-u-trim\">\n<p style=\"text-align: center;\"><iframe loading=\"lazy\" src=\"https:\/\/www.youtube-nocookie.com\/embed\/YDhfF4C5ESc\" width=\"560\" height=\"315\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/p>\n<p><center><strong>2D edge impacting free surface, view of the mesh.<\/strong><\/center><br \/>\n<\/div><\/div>\n<div class=\"su-column su-column-size-1-2\"><div class=\"su-column-inner su-u-clearfix su-u-trim\">\n<p style=\"text-align: center;\"><iframe loading=\"lazy\" src=\"https:\/\/www.youtube-nocookie.com\/embed\/49TkUbZu1No\" width=\"560\" height=\"315\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/p>\n<p><center><strong>Edge impacting free surface calculated with improved level set formulation.<\/strong><\/center><br \/>\n<\/div><\/div>\n<\/div>\n<div class=\"su-row\">\n<div class=\"su-column su-column-size-1-2\"><div class=\"su-column-inner su-u-clearfix su-u-trim\">\n<img decoding=\"async\" class=\"aligncenter\" src=\"\/wp-content\/uploads\/Marine-edge-vertical.png\" width=\"300\" \/><\/p>\n<p><center><strong>2D falling edge. Plot of the vertical acceleration.<\/strong><\/center><br \/>\n<\/div><\/div>\n<div class=\"su-column su-column-size-1-2\"><div class=\"su-column-inner su-u-clearfix su-u-trim\">\n<img decoding=\"async\" class=\"aligncenter\" src=\"\/wp-content\/uploads\/Marine-edge-angular.png\" width=\"300\" \/><\/p>\n<p><center><strong>2D falling edge. Plot of the angular acceleration.<\/strong><\/center><br \/>\n<\/div><\/div>\n<\/div>\n<p class=\"thescrollup\"><a href=\"#top\"><img decoding=\"async\" src=\"https:\/\/www.lemma-ing.com\/wp-content\/plugins\/scrollup\/arrow.png\" alt=\"&#9660; Sommet\" title=\"&#9660; Sommet\" \/><\/a><\/p>\n<\/div><\/div>\n<div class=\"su-spoiler su-spoiler-style-fancy su-spoiler-icon-plus su-spoiler-closed\" data-scroll-offset=\"0\" data-anchor-in-url=\"no\"><div class=\"su-spoiler-title\" tabindex=\"0\" role=\"button\"><span class=\"su-spoiler-icon\"><\/span>Numerical investigation of thermally stratified wake<\/div><div class=\"su-spoiler-content su-u-clearfix su-u-trim\">\n<p>For further details about this study, please click <a title=\"Featured technology: high order numerical methods\" href=\"\/?page_id=1285\" target=\"_blank\" rel=\"noopener noreferrer\">here<\/a>.<\/p>\n<\/div><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":229,"featured_media":0,"parent":66,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"full-width.php","meta":{"footnotes":""},"class_list":["post-974","page","type-page","status-publish","hentry"],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.lemma-ing.com\/index.php?rest_route=\/wp\/v2\/pages\/974","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.lemma-ing.com\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.lemma-ing.com\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.lemma-ing.com\/index.php?rest_route=\/wp\/v2\/users\/229"}],"replies":[{"embeddable":true,"href":"https:\/\/www.lemma-ing.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=974"}],"version-history":[{"count":53,"href":"https:\/\/www.lemma-ing.com\/index.php?rest_route=\/wp\/v2\/pages\/974\/revisions"}],"predecessor-version":[{"id":3246,"href":"https:\/\/www.lemma-ing.com\/index.php?rest_route=\/wp\/v2\/pages\/974\/revisions\/3246"}],"up":[{"embeddable":true,"href":"https:\/\/www.lemma-ing.com\/index.php?rest_route=\/wp\/v2\/pages\/66"}],"wp:attachment":[{"href":"https:\/\/www.lemma-ing.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=974"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}