\n\tESDU 00006 develops a method for predicting the drag where the
\ncavity length is large compared to the depth and the shear flow
\nenters the cavity and attaches to the floor before separating to
\npass over the rear wall with a stagnation point near the top of the
\nwall (i.e. closed flow). A family of curves suggests an upper limit
\nof cavity depth to length ratio for closed flow in terms of
\nfree-stream Mach number and cavity width to length or width to
\nheight ratio. In supersonic flow it is possible for vortices to
\nform as the shear flow spills over the side edges of the cavity and
\ntheir impingement on the rear wall gives rise to an increase in
\ndrag for which an estimation method is also provided. Tables give
\nthe ranges of parameters covered in the construction of the method.
\nThe prediction of the ratio of the drag coefficient, based on floor
\narea, to the local skin friction coefficient at the cavity
\nmid-length station (in the absence of the cavity) is assessed to be
\nwithin 1 for low-speed flow (Mach number less than 0.1) and to
\nwithin 2 for high-speed flow (Mach number between 0.5 and 3).
\nWorked examples illustrate the use of the method. A companion ESDU
\ndocument, ESDU 00007, deals with other types of cavity flow, known
\nas transitional and open. The third Item in the series, ESDU 10016,
\ndeals with the effect on cavity drag of a pair of doors open at
\n90\u00b0, including the effects of three different treatments of the
\ndoor leading and trailing edges.\n\t<\/p>\n","protected":false},"excerpt":{"rendered":"
Drag of a Rectangular Planform Cavity in a Flat Plate with a Turbulent Boundary Layer for Mach Numbers Up to 3 – Part I: Closed Flow<\/b><\/p>\n\n\n
\n Published By<\/td>\n Publication Date<\/td>\n Number of Pages<\/td>\n<\/tr>\n \n ESDU<\/b><\/a><\/td>\n 2011-10-01<\/td>\n 63<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":557164,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2675],"product_tag":[],"class_list":{"0":"post-557154","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-esdu","8":"first","9":"instock","10":"sold-individually","11":"shipping-taxable","12":"purchasable","13":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/557154","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/557164"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=557154"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=557154"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=557154"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}