tag:blogger.com,1999:blog-37936507.post6745533472052308979..comments2023-08-08T10:25:47.529+01:00Comments on McCabism: Lotus 72 CFDGordon McCabehttp://www.blogger.com/profile/09151162643523937086noreply@blogger.comBlogger4125tag:blogger.com,1999:blog-37936507.post-48648520898855566312014-01-04T19:48:34.974+00:002014-01-04T19:48:34.974+00:00I would say separation has a tendency to spread in...I would say separation has a tendency to spread in a lateral direction simply because of the friction between adjacent layers of fluid. However, 3d boundary layers can be complex. Even within each diffuser channel, there will be pressure gradients in a crossflow direction, and the fences separating the channels can also be used to generate vortices. Here's one paper, albeit a few decades old:<br /><br />http://www.annualreviews.org/doi/abs/10.1146/annurev.fl.14.010182.000425?journalCode=fluidGordon McCabehttps://www.blogger.com/profile/09151162643523937086noreply@blogger.comtag:blogger.com,1999:blog-37936507.post-58770872320078643722014-01-04T01:39:17.430+00:002014-01-04T01:39:17.430+00:00Does that mean that if the flow moves laterally th...Does that mean that if the flow moves laterally that it in effect has spent kinetic energy in the wrong direction as to get out the diffuser it should flow as straight as possible from front to back ? What is the mechanism by which say a small separation bubble "spreads" into huge bubble without the fences (I mean is it correct to infer that) ? Any suggestions for good literature<br />on this separation of 3D boundary layers ?<br /><br />Keep up the good work.Anonymoushttps://www.blogger.com/profile/04447248287886846510noreply@blogger.comtag:blogger.com,1999:blog-37936507.post-9545765556316108002014-01-03T17:28:20.792+00:002014-01-03T17:28:20.792+00:00Cheers Peter. Excellent work.
I'd need to de...Cheers Peter. Excellent work. <br /><br />I'd need to delve into the separation of a 3D-boundary layer to answer your question properly. The vertical fence ('splitter') forms a physical obstruction to crossflow between the different channels, and ensures that each channel has its own pressure gradient. If the boundary layer separates in one channel it therefore doesn't necessarily in the adjacent channel.Gordon McCabehttps://www.blogger.com/profile/09151162643523937086noreply@blogger.comtag:blogger.com,1999:blog-37936507.post-84179564352406483492014-01-01T17:57:12.498+00:002014-01-01T17:57:12.498+00:00Merry X-mas and Happy New Year Professor McCabe !!...Merry X-mas and Happy New Year Professor McCabe !! <br /><br />My present to you:<br /><br />https://dspace.lboro.ac.uk/dspace-jspui/handle/2134/13646<br /><br />2013 PhD Thesis on Multi_Channel<br />Race Car Diffusers<br /><br />I cannot wait to buy the book you mentioned in your post !! <br /><br />Please tell me how splitter plates<br />"constrain" separation in the diffuser. What is the physical mechanism by which this is achieved. The author did not detail it enough in this comprehensive paper.<br /><br />Cheers !!Anonymoushttps://www.blogger.com/profile/04447248287886846510noreply@blogger.com