{"id":3262,"date":"2026-04-05T22:31:04","date_gmt":"2026-04-05T20:31:04","guid":{"rendered":"https:\/\/silentdynamics.de\/?p=3262"},"modified":"2026-05-13T10:04:33","modified_gmt":"2026-05-13T08:04:33","slug":"fiber-composite-propeller-blades","status":"publish","type":"post","link":"https:\/\/silentdynamics.de\/en\/2026\/04\/05\/fiber-composite-propeller-blades\/","title":{"rendered":"Fluid-Structure Coupling for Composite Propellers: CFD with OpenFOAM and Code_Aster"},"content":{"rendered":"<p>Modern fiber-reinforced composite ship and flow propellers offer significant advantages over traditional metal propellers \u2013 lower weight, improved cavitation properties, and the possibility of passive pitch adjustment through targeted anisotropy. However, their flexibility presents particular design challenges: the aerodynamic or hydrodynamic performance can only be correctly assessed if the structural deformation under operational load is included in the simulation.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Composite Propellers: Opportunities and Design Challenges<\/h2>\n\n\n\n<p>Propeller with wings made of <strong>Fiber composites<\/strong> \u2013 especially those made of carbon fiber-reinforced plastic (CFK) or glass fiber-reinforced plastic (GFK) \u2013 are elastically deformable under operating loads. This flexibility is not a design flaw, but can be used strategically:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Passive pitch adjustment<\/strong>Through targeted fiber orientation, the wing twists into a more favorable airflow as the load increases \u2013 automatically, without active mechanics.<\/li>\n\n\n\n<li><strong>Cavitation reduction<\/strong>The adjustment of the blade geometry under load can smooth out pressure peaks, thereby reducing the risk of cavitation.<\/li>\n\n\n\n<li><strong>Noise reduction<\/strong>Reduced pressure pulsations through optimized load distribution over the blade<\/li>\n\n\n\n<li><strong>Weight savings<\/strong>CFK propellers are significantly lighter than bronze or stainless steel propellers of the same stiffness.<\/li>\n<\/ul>\n\n\n\n<p>The flip side: When interpreting, you must consider <strong>Deformation of the wings under operating load must be taken into account.<\/strong>. A purely rigid CFD simulation would systematically mispredict the actual geometry in operation\u2014and thus thrust, torque, and efficiency.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What is Fluid-Structure Interaction (FSI)?<\/h2>\n\n\n\n<p>The <strong>Fluid-Structure Interaction (FSI)<\/strong> describes the interaction between a flowing fluid and an elastic structure. In the case of a composite propeller, this means:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The <strong>Fluid<\/strong> (water or air) exerts thrust on the propeller blades<\/li>\n\n\n\n<li>The <strong>Structure<\/strong> deforms elastically as a result of these forces<\/li>\n\n\n\n<li>The altered geometry in turn influences the <strong>Flow<\/strong> \u2013 and thus the pressure distribution<\/li>\n\n\n\n<li>This cycle will <strong>iterative until convergence<\/strong> solved<\/li>\n<\/ul>\n\n\n\n<p>Depending on the stiffness of the structure and the strength of the flow forces, this coupling effect can be small and negligible\u2014or so dominant that it fundamentally determines the design. With flexible composite propellers, the latter is usually the case.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Our Software Solution: OpenFOAM + Code_Aster Fully Coupled<\/h2>\n\n\n\n<p>We have a specialized <strong>Software solution for FSI simulation of composite propellers<\/strong> developed a solution that combines two leading open-source programs into a powerful, fully automated workflow:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>OpenFOAM<\/strong> The CFD simulation handles: calculation of the flow field, pressure distribution, and hydrodynamic forces on the propeller blade \u2013 including rotating mesh regions (MRF or Sliding Mesh).<\/li>\n\n\n\n<li><strong>Code_Aster<\/strong> addresses the structural mechanics aspect: finite element analysis of the anisotropic composite material under the applied fluid forces, calculation of deformations and stresses in the laminate<\/li>\n\n\n\n<li>An <strong>Matching algorithm<\/strong> transfers forces and displacements between the two solvers and updates the CFD mesh in accordance with the structural deformation (dynamic mesh morphing)<\/li>\n<\/ul>\n\n\n\n<p>Both tools are completely open-source \u2013 with no licensing costs, full transparency, and maximum adaptability to specific project requirements.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Technical Features of Our FSI Solution<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Anisotropic Material Modeling<\/strong>: Code_Aster models the laminate structure of CFRP and GFRP composites layer by layer\u2014including direction-dependent stiffness and strength properties<\/li>\n\n\n\n<li><strong>Cavitation modeling<\/strong>: Optionally, the FSI simulation can be extended to include a cavitation model in order to capture the interaction between phase change and blade deformation<\/li>\n\n\n\n<li><strong>Automated workflow<\/strong>: The entire simulation workflow\u2014meshing, solver setup, coupling, and post-processing\u2014is script-driven and reproducible within the InsightCAE framework<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Results and key figures from the FSI simulation<\/h2>\n\n\n\n<p>From a complete fluid-structure interaction simulation for composite propellers, you will obtain, among other things:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Thrust and torque characteristics considering the actual operating geometry<\/li>\n\n\n\n<li>Displacement field (from which deflection, twist, torsion) over the entire propeller blade<\/li>\n\n\n\n<li>Stress and Strain Distributions in Laminates \u2013 Basis for Strength Verification according to Puck, Tsai-Wu, or Similar Criteria<\/li>\n\n\n\n<li>Pressure distribution on the suction and pressure sides of the wings<\/li>\n\n\n\n<li>Cavitation index and cavitation propagation (with extended modeling)<\/li>\n\n\n\n<li>Efficiency and operating point stability across the entire characteristic curve range<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Areas of application<\/h2>\n\n\n\n<p>Our FSI solution for composite propellers can be used in the following areas:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Carbon fiber or glass fiber ship propellers for high-performance and sports boats<\/li>\n\n\n\n<li>Underwater drones and AUV propulsion with noise emission or lightweight requirements<\/li>\n\n\n\n<li>Wind turbine rotor blades (small wind turbines, vertical axis systems)<\/li>\n\n\n\n<li>Tidal stream turbines with flexible composite blades<\/li>\n\n\n\n<li>Research applications for validating FSI algorithms<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion: Precise propeller design through physically consistent FSI simulation<\/h2>\n\n\n\n<p>Those who design composite propellers with rigid CFD risk systematic errors in performance prediction and structural design. Our coupled simulation solution, based on OpenFOAM and Code_Aster, closes this gap \u2013 cost-efficient, transparent, and fully automated. This allows you to design composite propellers as they actually work: deformed, stressed, and performance-optimized.<\/p>\n\n\n\n<p><em>Are you developing a composite propeller and need a robust FSI simulation? <a href=\"\/en\/kontakt\/\">Contact Us<\/a> We guide you from geometry to the validated result.<\/em><\/p>","protected":false},"excerpt":{"rendered":"<p>Moderne Schiffs- und Str\u00f6mungspropeller aus Faserverbundwerkstoffen bieten gegen\u00fcber klassischen Metallpropellern erhebliche Vorteile \u2013 geringeres Gewicht, verbesserte Kavitationseigenschaften und die M\u00f6glichkeit zur passiven Pitchanpassung durch gezielte Anisotropie. Doch ihre Flexibilit\u00e4t stellt die Auslegung vor besondere Herausforderungen: Die aerodynamische oder hydrodynamische Performance kann nur dann korrekt bewertet werden, wenn die strukturelle Verformung unter Betriebslast in die Simulation [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":307,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[970,964],"tags":[],"class_list":["post-3262","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-strukturmechanik","category-turbomaschinen"],"_links":{"self":[{"href":"https:\/\/silentdynamics.de\/en\/wp-json\/wp\/v2\/posts\/3262","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/silentdynamics.de\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/silentdynamics.de\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/silentdynamics.de\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/silentdynamics.de\/en\/wp-json\/wp\/v2\/comments?post=3262"}],"version-history":[{"count":4,"href":"https:\/\/silentdynamics.de\/en\/wp-json\/wp\/v2\/posts\/3262\/revisions"}],"predecessor-version":[{"id":3400,"href":"https:\/\/silentdynamics.de\/en\/wp-json\/wp\/v2\/posts\/3262\/revisions\/3400"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/silentdynamics.de\/en\/wp-json\/wp\/v2\/media\/307"}],"wp:attachment":[{"href":"https:\/\/silentdynamics.de\/en\/wp-json\/wp\/v2\/media?parent=3262"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/silentdynamics.de\/en\/wp-json\/wp\/v2\/categories?post=3262"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/silentdynamics.de\/en\/wp-json\/wp\/v2\/tags?post=3262"}],"curies":[{"name":"WordPress","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}