{"id":3038,"date":"2022-02-28T14:15:39","date_gmt":"2022-02-28T13:15:39","guid":{"rendered":"https:\/\/silentdynamics.de\/?p=3038"},"modified":"2022-02-28T14:16:22","modified_gmt":"2022-02-28T13:16:22","slug":"simulation-der-entgasung-von-fluessigkeiten-mit-openfoam","status":"publish","type":"post","link":"https:\/\/silentdynamics.de\/en\/2022\/02\/28\/simulation-der-entgasung-von-fluessigkeiten-mit-openfoam\/","title":{"rendered":"Simulation of Gas Removal from Liquids with OpenFOAM"},"content":{"rendered":"<p>Lack of space and high cost pressure ultimately lead to increasingly complex and smaller hydraulic tanks. This results in a drastic reduction of air separation in the tank \u2013 and thus to an increased amount of free air in the hydraulic system.<\/p>\n<p>In hydraulic systems, free air remains a technical challenge today. As long as the air is dissolved in the oil, it does not alter its properties.<\/p>\n<p>Unresolved air, i.e., air bubbles, cause:<\/p>\n<p>Corrosion on pumps and controls<br \/>Reduced efficiency of pumps and hydraulic motors, increased compressibility and thus possible jerky movements in the drive. In addition, there is\u00a0<\/p>\n<ul>\n<li>Accelerated oil aging<\/li>\n<li>Noise increase<\/li>\n<li>Damage to components (e.g., cavitation)<\/li>\n<li>etc.<\/li>\n<\/ul>\n<p>Air enters the system during assembly, through leaks in the negative pressure area, and when oil flows back into the tank. Depending on the separation efficiency of the filter-tank system, the air rises slowly in the tank and is drawn back in by the pump.<\/p>\n<p><strong>Simulation in Air-Liquid Tanks<\/strong><\/p>\n<p>Silentdynamics uses InsightCAE to perform a series of simulations of dispersed gas bubbles in a degassing tank. The application of the solver <em>twoPhaseEulerFoam<\/em> enables the unsteady-state tracking of the gas phase, integral values of air at the outlets, and the overall quality of the degassing device.\u00a0<\/p>\n<p>As an example, a simple degassing example is presented. One inlet and two outlets, including a wear plate in the middle. The oil-gas mixture moves over the wear plate for degassing.<\/p>\n<p><a href=\"https:\/\/silentdynamics.de\/wp-content\/uploads\/2022\/01\/geo.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-2956\" src=\"https:\/\/silentdynamics.de\/wp-content\/uploads\/2022\/01\/geo.png\" alt=\"\" width=\"600\" height=\"524\" srcset=\"https:\/\/silentdynamics.de\/wp-content\/uploads\/2022\/01\/geo.png 827w, https:\/\/silentdynamics.de\/wp-content\/uploads\/2022\/01\/geo-300x262.png 300w, https:\/\/silentdynamics.de\/wp-content\/uploads\/2022\/01\/geo-768x670.png 768w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/a> \u00a0<\/p>\n<p>After setting the gas-oil dispersion boundary conditions such as gas bubble size, mixing coefficients, phase properties, etc., the simulation was able to proceed with <em>twoPhaseEulerFoam<\/em> to be started.<\/p>\n<p>Using the advanced solver settings within InsightCAE allows for large time steps to be taken, enabling simulations to be completed in a reasonable amount of time.<\/p>\n<p>Iso-surfaces of at a gas phase fraction of 1%.<\/p>\n<hr \/>\n\n\n<figure class=\"wp-block-image size-full is-resized\"><a href=\"https:\/\/silentdynamics.de\/wp-content\/uploads\/2022\/01\/oilphase.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/silentdynamics.de\/wp-content\/uploads\/2022\/01\/oilphase.png\" alt=\"\" class=\"wp-image-2961\" width=\"542\" height=\"528\" srcset=\"https:\/\/silentdynamics.de\/wp-content\/uploads\/2022\/01\/oilphase.png 833w, https:\/\/silentdynamics.de\/wp-content\/uploads\/2022\/01\/oilphase-300x292.png 300w, https:\/\/silentdynamics.de\/wp-content\/uploads\/2022\/01\/oilphase-768x749.png 768w\" sizes=\"auto, (max-width: 542px) 100vw, 542px\" \/><\/a><\/figure>\n\n\n\n<p>The modification of the degassing tank's geometry using numerical simulation leads to a sufficient degassing process of the hydraulic oil. <\/p>","protected":false},"excerpt":{"rendered":"<p>Platzmangel und hoher Kostendruck f\u00fchren letztlich dazu, dass Hydrauliktanks immer komplexer und kleiner werden. Dies f\u00fchrt zu einer drastischen Verringerung der Luftabscheidung im Tank &#8211; und damit zu einem erh\u00f6hten Anteil an freier Luft im Hydrauliksystem. In hydraulischen Systemen ist die freie Luft auch heute noch eine technische Herausforderung. Solange die Luft im \u00d6l gel\u00f6st [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2963,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[951],"tags":[],"class_list":["post-3038","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-simulation"],"_links":{"self":[{"href":"https:\/\/silentdynamics.de\/en\/wp-json\/wp\/v2\/posts\/3038","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=3038"}],"version-history":[{"count":0,"href":"https:\/\/silentdynamics.de\/en\/wp-json\/wp\/v2\/posts\/3038\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/silentdynamics.de\/en\/wp-json\/wp\/v2\/media\/2963"}],"wp:attachment":[{"href":"https:\/\/silentdynamics.de\/en\/wp-json\/wp\/v2\/media?parent=3038"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/silentdynamics.de\/en\/wp-json\/wp\/v2\/categories?post=3038"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/silentdynamics.de\/en\/wp-json\/wp\/v2\/tags?post=3038"}],"curies":[{"name":"WordPress","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}