{"id":1491,"date":"2020-09-23T08:04:29","date_gmt":"2020-09-23T08:04:29","guid":{"rendered":"https:\/\/windsim.com\/?page_id=1491"},"modified":"2020-11-02T09:39:22","modified_gmt":"2020-11-02T09:39:22","slug":"validating-cfds-value","status":"publish","type":"page","link":"https:\/\/windsim.com\/validating-cfds-value\/","title":{"rendered":"Validating CFD&#8217;s value"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"1491\" class=\"elementor elementor-1491\" data-elementor-post-type=\"page\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-37dbed44 elementor-section-full_width elementor-section-height-min-height elementor-section-height-default elementor-section-items-middle\" data-id=\"37dbed44\" data-element_type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-5c3e59d7\" data-id=\"5c3e59d7\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-53076b3 elementor-widget elementor-widget-heading\" data-id=\"53076b3\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h1 class=\"elementor-heading-title elementor-size-default\">Validating CFD`s value<\/h1>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-77f03501 elementor-section-content-middle elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"77f03501\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-5e24ed79 elementor-hidden-tablet elementor-hidden-phone\" data-id=\"5e24ed79\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-17eb8e85 elementor-nav-menu--dropdown-tablet elementor-nav-menu__text-align-aside elementor-nav-menu--toggle elementor-nav-menu--burger elementor-widget elementor-widget-nav-menu\" data-id=\"17eb8e85\" data-element_type=\"widget\" data-settings=\"{&quot;layout&quot;:&quot;vertical&quot;,&quot;submenu_icon&quot;:{&quot;value&quot;:&quot;&lt;i class=\\&quot;fas fa-caret-down\\&quot;&gt;&lt;\\\/i&gt;&quot;,&quot;library&quot;:&quot;fa-solid&quot;},&quot;toggle&quot;:&quot;burger&quot;}\" data-widget_type=\"nav-menu.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t<nav class=\"elementor-nav-menu--main elementor-nav-menu__container elementor-nav-menu--layout-vertical e--pointer-background e--animation-fade\">\n\t\t\t\t<ul id=\"menu-1-17eb8e85\" class=\"elementor-nav-menu sm-vertical\"><li class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-329\"><a href=\"https:\/\/windsim.com\/learning-windsim\/\" class=\"elementor-item\">Learning WindSim<\/a><\/li>\n<li class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-330\"><a href=\"https:\/\/windsim.com\/library\/windsim-brochures\/\" class=\"elementor-item\">WindSim Brochures<\/a><\/li>\n<li class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-331\"><a href=\"https:\/\/windsim.com\/library\/videos\/\" class=\"elementor-item\">Videos<\/a><\/li>\n<li class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-332\"><a href=\"https:\/\/windsim.com\/library\/papers-presentations\/\" class=\"elementor-item\">Papers &#038; 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continued from WindSim | Newsletter | Winter 2009<\/p><p>How good is CFD? How accurate is it? Is it better than the traditional linear methods?<\/p><p>We get these questions every day.<\/p><p>The people who ask often want straightforward and simple answers. It&#8217;s tempting for us to reply \u201cCFD is the best\u201d when pressed for a short, simple answer to such questions. However, oversimplification is reckless when dealing with complex phenomenon such as the variation of wind in space and time.<\/p><p>Let&#8217;s start with a brief explanation of why we feel CFD is the best modeling approach and how the value of CFD is being validated today.<\/p><p>The strength of CFD is revealed by looking at its basis. The fundamental equation of fluid flow consists of a set of non-linear partial differential equations, the so-called Navier-Stokes equations. These equations are known to be difficult to solve due to their non-linear nature. Nevertheless, in numerous flow situations\u2014and in various industries over many years\u2014CFD reproduces the measured flow patterns, and is therefore considered a proven method.<\/p><p>What is the status within the wind sector? Local wind fields are turbulent and often influenced by variable density, topography, and vegetation. In principle, CFD can take all these effects into account using fundamental equations. Still, there will always be discrepancies when comparing simulation results and on-site measurements because neither the simulations nor the measurements are always perfect.<\/p><p>Hence, we need a large number of validation cases to distinguish the strengths and the shortcomings of the different wind characterization methods. There are only very few validation cases which are suitable for a proper validation. Typically, a good validation case needs to be well instrumented with good measurement equipment. And, in particular, the conditions along the border of the numerical model must be measured.<\/p><p>Validation is critical with all modeling approaches. WindSim proudly participated in\u00a0<a title=\"The Bolund Experiment\" href=\"https:\/\/windsim.com\/library\/the-bolund-experiment.aspx\">the Bolund experiment<\/a>, a new validation case undertaken by Ris\u00f8, and congratulates our fellow contributors.<\/p><p>The CFD methods\u2014including WindSim\u2014showed the lowest errors among the various methods used.<\/p><p>\u00a0<\/p><p><img decoding=\"async\" src=\"https:\/\/windsim.com\/images\/bolund_239.jpg\" \/><\/p><p><em>Normalized wind speed at 5 meters height with wind direction from 239 degrees for the Bolund experiment. Measurements are given by black boxes. The solid pink line\u00a0shows the WindSim results. The\u00a0other lines are results from other methods.<\/em><\/p><p>\u00a0<\/p><p>The challenge is passed over to the wind sector\u2014it is only the sector itself that can make CFD a proven method for the design of more profitable wind farms.<\/p><\/div><div id=\"subNavigation\">\u00a0<\/div>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Validating CFD`s value Validating CFD&#8217;s Value &#8230; continued from WindSim | Newsletter | Winter 2009 How good is CFD? How accurate is it? Is it better than the traditional linear methods? We get these questions every day. The people who ask often want straightforward and simple answers. It&#8217;s tempting for us to reply \u201cCFD is [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"content-type":"","om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/windsim.com\/wp-json\/wp\/v2\/pages\/1491"}],"collection":[{"href":"https:\/\/windsim.com\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/windsim.com\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/windsim.com\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/windsim.com\/wp-json\/wp\/v2\/comments?post=1491"}],"version-history":[{"count":0,"href":"https:\/\/windsim.com\/wp-json\/wp\/v2\/pages\/1491\/revisions"}],"wp:attachment":[{"href":"https:\/\/windsim.com\/wp-json\/wp\/v2\/media?parent=1491"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}