{"id":2954,"date":"2022-01-06T13:19:26","date_gmt":"2022-01-06T12:19:26","guid":{"rendered":"https:\/\/silentdynamics.de\/?p=2954"},"modified":"2022-01-06T14:55:31","modified_gmt":"2022-01-06T13:55:31","slug":"exporting-a-step-file-with-named-surfaces-from-ptc-creo-2","status":"publish","type":"post","link":"https:\/\/silentdynamics.de\/en\/2022\/01\/06\/exporting-a-step-file-with-named-surfaces-from-ptc-creo-2\/","title":{"rendered":"Degassing simulation using OpenFOAM"},"content":{"rendered":"<p>Space limitations and high cost pressures increasingly lead to more complex and smaller hydraulic tanks. This results in a dramatic reduction of air separation in the tank and, consequently, an increased amount of free air in the hydraulic system.<\/p>\n<p>In hydraulic systems, free air is still a technical challenge today. As long as the air is dissolved in the oil, it does not change its properties.<\/p>\n<p>On the other hand, undissolved air, i.e., air bubbles, cause:<\/p>\n<ul>\n<li>Corrosion on pumps and controls<\/li>\n<li>Increased compressibility of hydraulic fluid can reduce the efficiency of pumps and hydraulic motors, leading to possible stuttering movements of the output member.<\/li>\n<li>Accelerated oil aging<\/li>\n<li>varnish noise<\/li>\n<li>Damage to the components (e.g. cavitation)<\/li>\n<li><span style=\"font-size: revert; color: initial;\">etc.<\/span><\/li>\n<\/ul>\n<p>Air enters the circuit during assembly, through leaks in the negative pressure zone, and as oil flows back into the reservoir. Depending on the separation capacity of the filter-tank system, the air in the tank only rises slowly and is then re-sucked by the pump.<\/p>\n<h3>Simulation of air-liquid devices<\/h3>\n<p>Silentdynamics uses InsightCAE to perform a number of simulations of dispersed gas bubbles in a degassing tank. Application of the solver <em>twoPhaseEulerFoam<\/em> enables the transient tracking of the gas phase, integral values of air at the outlets, and overall the quality of the degassing device.&nbsp;<\/p>\n<p>As an example, a simple degassing scenario is presented. There is one inlet and two outlets, with a weir located in the center. The oil-gas mixture flows over the weir 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> &nbsp;<\/p>\n<p>Setting up gas-oil dispersion boundary conditions such as gas bubble size, blending coefficients, and phase properties for the simulation using <em>twoPhaseEulerFoam <\/em>could be initiated.<\/p>\n<p>Using advanced solver settings within the InsightCAE framework, large time steps are enabled to manage simulations within a reasonable timeframe.<\/p>\n<p>Isosurfaces of 1% gas are presented.&nbsp;<\/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>Changing the degassing tank geometry using numerical simulation leads to a sufficient degassing process of the hydraulic oil. <\/p>","protected":false},"excerpt":{"rendered":"<p>Space limitations and high cost pressure ultimately lead to hydraulic tanks becoming increasingly complex and smaller. This leads to a dramatic reduction in air separation in the tank &#8211; and thus to an increased amount of free air in the hydraulic system. In hydraulic systems, free air is still a technical challenge today. As long [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2963,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[191],"tags":[],"class_list":["post-2954","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-oss-cae-blog"],"_links":{"self":[{"href":"https:\/\/silentdynamics.de\/en\/wp-json\/wp\/v2\/posts\/2954","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=2954"}],"version-history":[{"count":0,"href":"https:\/\/silentdynamics.de\/en\/wp-json\/wp\/v2\/posts\/2954\/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=2954"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/silentdynamics.de\/en\/wp-json\/wp\/v2\/categories?post=2954"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/silentdynamics.de\/en\/wp-json\/wp\/v2\/tags?post=2954"}],"curies":[{"name":"WordPress","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}