{"id":320462,"date":"2023-12-01T12:52:54","date_gmt":"2023-12-01T12:52:54","guid":{"rendered":"\/forum\/forums\/topic\/pressure-spikes-at-inlet-in-straight-tube-under-large-laminar-flow\/"},"modified":"2023-12-01T12:52:54","modified_gmt":"2023-12-01T12:52:54","slug":"pressure-spikes-at-inlet-in-straight-tube-under-large-laminar-flow","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/pressure-spikes-at-inlet-in-straight-tube-under-large-laminar-flow\/","title":{"rendered":"Pressure &#8216;spikes&#8217; at inlet in straight tube under large, laminar flow"},"content":{"rendered":"<p>Hi all,<\/p>\n<p class=\"MsoNormal\"><span lang=\"EN-US\">I have a straight tube with a length of 10 cm and a diameter of 2 cm (simple representation of a vessel). At the inlet, I prescribe a patient specific inlet velocity and at the outlet I have a 3 element windkessel model. I tuned the WK parameters in such a way that outlet pressure is between 80 and 120 mmHg (10000\/16000 Pa). However, I get these &lsquo;spikes&rsquo; in pressure. My timestep was 1 ms, I am using the PISO pressure-velocity coupling method and I chose laminar flow.&nbsp;<\/span><\/p>\n<p class=\"MsoNormal\"><span lang=\"EN-US\"><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/12\/01-12-2023-1701435017-mceclip0.png\"><\/span><\/p>\n<p class=\"MsoNormal\"><span lang=\"EN-US\">What we already tried:<\/span><\/p>\n<p class=\"MsoListParagraphCxSpFirst\" style=\"text-indent: -18.0pt\"><!-- [if !supportLists]--><span lang=\"EN-US\"><span>&#8211;<span style=\"font: 7.0pt 'Times New Roman'\">&nbsp; &nbsp; &nbsp; &nbsp; <\/span><\/span><\/span><!--[endif]--><span lang=\"EN-US\">Lower the peak flow, this decreases the spikes suggesting that the difficulties mainly arise when the change in flow rate (increase or decrease) is large. <\/span><\/p>\n<p class=\"MsoListParagraphCxSpMiddle\" style=\"text-indent: -18.0pt\"><!-- [if !supportLists]--><span lang=\"EN-US\"><span>&#8211;<span style=\"font: 7.0pt 'Times New Roman'\">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <\/span><\/span><\/span><!--[endif]--><span lang=\"EN-US\">Lower the timestep, this did not change the results. <\/span><\/p>\n<p class=\"MsoListParagraphCxSpMiddle\" style=\"text-indent: -18.0pt\"><!-- [if !supportLists]--><span lang=\"EN-US\"><span>&#8211;<span style=\"font: 7.0pt 'Times New Roman'\">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <\/span><\/span><\/span><!--[endif]--><span lang=\"EN-US\">Decrease the mesh size, again no change in results. <\/span><\/p>\n<p class=\"MsoListParagraphCxSpMiddle\" style=\"text-indent: -18.0pt\"><!-- [if !supportLists]--><span lang=\"EN-US\"><span>&#8211;<span style=\"font: 7.0pt 'Times New Roman'\">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <\/span><\/span><\/span><!--[endif]--><span lang=\"EN-US\">Tried pseudo-time method, no change in results. <\/span><\/p>\n<p><!-- [if !supportLists]--><span lang=\"EN-US\">Adapt the WK parameters. Decreasing the compliance seems to improve the results, but then I did not get physiological pressures.<\/span><\/p>\n<ul>\n<li class=\"MsoListParagraphCxSpLast\" style=\"text-indent: -18pt\">We&#8217;re kind of lost now \ud83d\ude41&nbsp;<\/li>\n<li class=\"MsoListParagraphCxSpLast\" style=\"text-indent: -18pt\">Do any of you have suggestions on how to tackle this problem?<\/li>\n<\/ul>\n","protected":false},"template":"","class_list":["post-320462","topic","type-topic","status-closed","hentry","topic-tag-fluent-cfd-ansys-1","topic-tag-instability","topic-tag-numerical-instability-2"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hi all,I have a straight tube with a length of 10 cm and a diameter of 2 cm (simple representation of a vessel). At the inlet, I prescribe a patient specific inlet velocity and at the outlet I have a 3 element windkessel model. 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