{"id":8192,"date":"2026-03-26T07:46:08","date_gmt":"2026-03-26T06:46:08","guid":{"rendered":"https:\/\/daes.pro\/carriere\/loading-waves-in-ansys-mechanical-detailed-example\/"},"modified":"2026-04-14T11:08:18","modified_gmt":"2026-04-14T09:08:18","slug":"loading-waves-in-ansys-mechanical-detailed-example","status":"publish","type":"post","link":"https:\/\/daes.pro\/en\/articles-en\/loading-waves-in-ansys-mechanical-detailed-example\/","title":{"rendered":"Loading waves in ANSYS Mechanical &#8211; Detailed example"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"8192\" class=\"elementor elementor-8192 elementor-8174\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-22c304e elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"22c304e\" data-element_type=\"section\" data-settings=\"{&quot;jet_parallax_layout_list&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-1ed0553a\" data-id=\"1ed0553a\" 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-18ee0c7b elementor-widget__width-initial elementor-widget elementor-widget-text-editor\" data-id=\"18ee0c7b\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<h2><span style=\"font-weight: normal;\">Introduction<\/span><\/h2>\n<p>The design of offshore and nearshore structures requires accurate assessment of hydrodynamic forces due to waves and currents. ANSYS Mechanical offers a dedicated module, the <strong>Offshore Module<\/strong>, which enables engineers to simulate these effects directly in the structural analysis environment. <\/p>\n<p>The Offshore module, based on the <strong>OCEAN APDL<\/strong> command library, is accessible from the <em>Add-ons<\/em> ribbon in ANSYS Mechanical (Figure 1). It supports linear and non-linear wave theories, enabling the simulation of wave-current interactions on complex 3D geometries without the need for specialized CFD software. <\/p>\n<figure><img decoding=\"async\" src=\"https:\/\/daes.pro\/wp-content\/uploads\/2026\/03\/image-1.png\" alt=\"image\"><p><\/p>\n<\/figure>\n<p><strong>Figure 1: Offshore module in ANSYS Mechanical<\/strong><\/p>\n<p>In this study, the capabilities of the Offshore module are demonstrated through wave loading analysis on a jacket structure immersed in Lake Geneva, the significant body of water closest to the DAES offices.<\/p>\n<p><em>Note: the effect of the Water Jet has not been taken into account!<\/em><\/p>\n<figure><b><img decoding=\"async\" src=\"https:\/\/daes.pro\/wp-content\/uploads\/2026\/03\/image-2.png\" alt=\"image\"><\/b><\/figure>\n<p><strong>Figure 2: Model considered for wave calculation<\/strong><\/p>\n<hr>\n<h2><span style=\"font-weight: normal;\">Setting up the case study<\/span><\/h2>\n<h3><span style=\"font-weight: normal;\">Site description<\/span><\/h3>\n<p>Lake Geneva is an interesting case study due to its geometry, wind exposure and bathymetry. Its maximum depth reaches around <strong>307 m<\/strong> in the central zone. The prevailing wind comes from the northeast, aligned with the main axis of the lake, which channels the waves towards the narrower, shallower bay of Geneva, favoring their amplification (see Figure 3).  <\/p>\n<figure><img decoding=\"async\" src=\"https:\/\/daes.pro\/wp-content\/uploads\/2026\/03\/image-3.png\" alt=\"image\"><\/figure>\n<p><strong>Figure 3: Bathymetry of Lake Geneva and zoom near Geneva<\/strong><\/p>\n<p>For this example, we consider that the structure is located in this bay, where the lake flows into the Rh\u00f4ne, adding a significant current.<\/p>\n<hr>\n<h2><span style=\"font-weight: normal;\">Description of the structure<\/span><\/h2>\n<p>As shown in Figure 2, the structure studied is a four-legged jacket, measuring :<\/p>\n<ul>\n<li><strong>7 m high<\/strong> (including 2 m above mean water level)<\/li>\n<li><strong>4 m wide<\/strong><\/li>\n<\/ul>\n<p>Modeling assumptions :<\/p>\n<ul>\n<li>Element type : <strong>BEAM188<\/strong><\/li>\n<li>Water depth: <strong>5 m<\/strong><\/li>\n<li>Global vertical axis: <strong>z axis<\/strong><\/li>\n<li>Boundary conditions: complete embedment at base of legs (no soil-pile interaction for simplicity)<\/li>\n<\/ul>\n<p>Although ANSYS can model pile-soil interaction (useful for deep foundations), this feature has not been used here to simplify the study.<\/p>\n<hr>\n<h2><span style=\"font-weight: normal;\">Definition of wave conditions<\/span><\/h2>\n<p>The Offshore module is added to the <em>Solution<\/em> branch of the model (see Figure 6). Some parameters are set automatically, but the choice of wave theory and environmental conditions must be carefully made by the user. <\/p>\n<p>Two main approaches are possible:<\/p>\n<ul>\n<li><strong>Regular wave (single)<\/strong>: for analysis at the ultimate limit state (ULS)<\/li>\n<li><strong>Wave spectrum<\/strong>: to represent random sea states (fatigue)<\/li>\n<\/ul>\n<p>In this analysis, extreme conditions were extracted from the Swisslake.net database for a <strong>50-year<\/strong> return period in the Bay of Geneva:<\/p>\n<ul>\n<li>Maximum wave height: <strong>Hmax = 1.25 m<\/strong><\/li>\n<li>Wave period: <strong>T = 4.4 s<\/strong><\/li>\n<\/ul><figure><img decoding=\"async\" src=\"https:\/\/daes.pro\/wp-content\/uploads\/2026\/03\/image-7.png\" alt=\"image\"><\/figure>\n<figure><img alt=\"\"><strong>Figure 4: Extreme conditions in the Bay of Geneva<br><br><\/strong><\/figure>\n<p>Given the depth and wave parameters, the intermediate depth regime applies. Suitable theories are :<\/p>\n<ul>\n<li>5th order current function<\/li>\n<li>Stokes of order 3<\/li>\n<\/ul>\n<figure><img decoding=\"async\" src=\"https:\/\/daes.pro\/wp-content\/uploads\/2026\/03\/image-5.png\" alt=\"image\"><\/figure>\n<p><strong>Figure 5: Validity range of wave theories<\/strong><\/p>\n<p>The simulation is therefore carried out using <strong>current function theory<\/strong>, with a 180\u00b0 phase shift to fully capture the wave crest (complete trough-peak-peak cycle).<\/p>\n<p>It is also important to check that the wavelength exceeds the width of the structure, so that it is fully subjected to the movement of the wave.<\/p>\n<p><strong>Figure 6: Definition of wave parameters<\/strong><\/p>\n<hr>\n<h2><span style=\"font-weight: normal;\">Current<\/span><\/h2>\n<p>In the absence of local measurements, a surface current velocity of <strong>1 m\/s<\/strong> is assumed, representing the combined effects of wind and Rh\u00f4ne flow.<\/p>\n<p>The current is assumed to be aligned with the wave (NE orientation), but a misalignment could easily be modeled.<\/p>\n<p>Advanced parameters (hydrodynamic coefficients, added masses, etc.) exist but are not covered here.<\/p>\n<p>A transient analysis is performed over a full wave period<strong>(4.4 s<\/strong>).<\/p>\n<hr>\n<h2><span style=\"font-weight: normal;\">Results and post-processing<\/span><\/h2>\n<p>The Offshore module provides several hydrodynamic quantities via customized outputs:<\/p>\n<ul>\n<li>fluid speed<\/li>\n<li>acceleration<\/li>\n<li>dynamic pressure<\/li>\n<li>wave amplitude<\/li>\n<li>hydrodynamic forces<\/li>\n<\/ul>\n<p>(Table 1: available variables &#8211; retained as is)<\/p>\n<hr>\n<h2><span style=\"font-weight: normal;\">Wave elevation<\/span><\/h2>\n<p>Figure 7 shows the evolution of the free surface over time.<\/p>\n<p>The non-linear wave features :<\/p>\n<ul>\n<li>a crest at <strong>+720 mm<\/strong><\/li>\n<li>a trough at <strong>-530 mm<\/strong><\/li>\n<\/ul>\n<p>The total height corresponds to :<\/p>\n<p><strong>H = 720 &#8211; (-530) = 1250 mm = 1.25 m<\/strong><\/p>\n<p>The wave is therefore correctly reproduced.<\/p>\n<hr>\n<h2><span style=\"font-weight: normal;\">Speed profiles<\/span><\/h2>\n<p>Figure 8 shows the distribution of water particle velocities:<\/p>\n<ul>\n<li>Current only&#8221; profile: from <strong>1 m\/s at the surface<\/strong> to <strong>0 m\/s at the bottom<\/strong><\/li>\n<li>Wave + current&#8221; profile: maximum speed \u2248 <strong>2.2 m\/s<\/strong> at crest \u2192 constructive interaction between wave and current<\/li>\n<\/ul>\n<hr>\n<h2><span style=\"font-weight: normal;\">Hydrodynamic forces and structural response<\/span><\/h2>\n<p>The tangential hydrodynamic forces (Fx) on the beam elements are shown in Figure 9.<\/p>\n<p>Results :<\/p>\n<ul>\n<li>periodic variation in accordance with wave loading<\/li>\n<li>maximum and minimum values plotted over a cycle<\/li>\n<\/ul>\n<hr>\n<h2><span style=\"font-weight: normal;\">Moving the structure<\/span><\/h2>\n<p>Figure 10 shows the total displacement (amplified \u00d74.3 for visualization).<\/p>\n<p>The deformation mode corresponds to the expected bending behavior under combined wave + current loading.<\/p>\n<hr>\n<h2><span style=\"font-weight: normal;\">Constraints<\/span><\/h2>\n<p>Figure 11 shows the combined stresses in the beams.<\/p>\n<p>Result:<\/p>\n<ul>\n<li>maximum stress \u2248 <strong>250 MPa<\/strong> at embedded base<\/li>\n<\/ul>\n<p>\u2192 The structure will withstand the extreme event if it is made of steel with a limit greater than 250 MPa.<\/p>\n<hr>\n<h2><span style=\"font-weight: normal;\">Conclusions<\/span><\/h2>\n<p>This study demonstrates the use of ANSYS Mechanical&#8217;s Offshore module to simulate the hydrodynamic forces due to waves on an offshore structure immersed in Lake Geneva.<\/p>\n<h2><span style=\"font-weight: normal;\">Key points:<\/span><\/h2>\n<ul>\n<li><strong>Current function<\/strong> theory effectively models non-linear waves in lake environments<\/li>\n<li>The Offshore module provides detailed results (speeds, accelerations, pressures, forces) without the need for CFD.<\/li>\n<li>Wave-current interaction generates a maximum surface velocity of around <strong>2.2 m\/s<\/strong>, strongly influencing the structural response.<\/li>\n<\/ul>\n<p>This workflow can be extended to :<\/p>\n<ul>\n<li>pile-soil interaction<\/li>\n<li>fatigue analysis<\/li>\n<li>offshore and nearshore design optimization<\/li>\n<\/ul><div><br><\/div><div><br><\/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>Introduction The design of offshore and nearshore structures requires accurate assessment of hydrodynamic forces due to waves and currents. ANSYS Mechanical offers a dedicated module, the Offshore Module, which enables engineers to simulate these effects directly in the structural analysis environment. The Offshore module, based on the OCEAN APDL command library, is accessible from the [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":8196,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"content-type":"","footnotes":""},"categories":[144,247],"tags":[240,252],"etiquettes":[],"class_list":["post-8192","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-articles-en","category-unclassified","tag-dynamic-analysis","tag-mechanical-analysis"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Loading waves in ANSYS Mechanical - Detailed example - Development of Advanced Engineering Solutions<\/title>\n<meta name=\"description\" content=\"Wave loading analysis with ANSYS Mechanical Offshore Module: detailed example of an offshore structure on Lake Geneva, with hydrodynamic modeling and full results.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/daes.pro\/en\/articles-en\/loading-waves-in-ansys-mechanical-detailed-example\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Loading waves in ANSYS Mechanical - 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