Separation on An album of computational fluid motion https://album-of-cfm.com/tags/separation/ Recent content in Separation on An album of computational fluid motion Hugo -- gohugo.io en Fri, 18 Aug 2023 00:00:00 +0000 Fig 24. Circular cylinder at R=1.54 https://album-of-cfm.com/chapters/02-laminar/fig24/ Fri, 18 Aug 2023 00:00:00 +0000 https://album-of-cfm.com/chapters/02-laminar/fig24/ ExperimentSimulation “At this Reynolds number the streamline pattern has clearly lost the fore-and-aft symmetry of figure 6. However, the flow has not yet separated at the rear. That begins at about R=5, though the value is not known accurately. Fig 35. Leading-edge separation on a plate with laminar reattachment https://album-of-cfm.com/chapters/03-separation/fig35/ Wed, 14 Jun 2023 00:00:00 +0000 https://album-of-cfm.com/chapters/03-separation/fig35/ ExperimentSimulation Air bubbles in water show the turbulent flow field and laminar reattachment on an inclined plate at Reynolds number \(Re = 10000\). At \(2.5^{\circ}\) inclination relative to the oncoming flow, the flow briefly separates from the upper surface at the leading edge before it reattaches to the inclined plate. Fig 36. Leading-edge separation on a plate with turbulent reattachment https://album-of-cfm.com/chapters/03-separation/fig36/ Sun, 18 Jun 2023 00:00:00 +0000 https://album-of-cfm.com/chapters/03-separation/fig36/ ExperimentSimulation Air bubbles in water show the turbulent flow field and turbulent reattachment on an inclined plate at Reynolds number \(Re = 50000\). At 2.5\(^{\circ}\) inclination relative to the oncoming flow, the flow separates from the upper surface, creating a turbulent boundary layer at the leading edge before reattaching to the inclined plate. Fig 37. Global separation over an inclined plate https://album-of-cfm.com/chapters/03-separation/fig37/ Fri, 30 Jun 2023 00:00:00 +0000 https://album-of-cfm.com/chapters/03-separation/fig37/ ExperimentSimulation Air bubbles in water show the turbulent flow field around an inclined plate at Reynolds number \(Re = 10000\). At 20\(^{\circ}\) inclination relative to the oncoming flow, the flow fully separates from the entire upper surface of the plate and creates a turbulent wake. Fig 40. Circular cylinder at R=9.6 https://album-of-cfm.com/chapters/03-separation/fig40/ Fri, 18 Aug 2023 00:00:00 +0000 https://album-of-cfm.com/chapters/03-separation/fig40/ ExperimentSimulation “Here, in contrast to figure 24, the flow has clearly separated to form a pair of recirculating eddies. The cylinder is moving through a tank of water containing aluminum powder, and is illuminated by a sheet of light below the tree surface. Fig 41. Circular cylinder at R=13.1 https://album-of-cfm.com/chapters/03-separation/fig41/ Fri, 18 Aug 2023 00:00:00 +0000 https://album-of-cfm.com/chapters/03-separation/fig41/ ExperimentSimulation “The standing eddies become elongated in the flow direction as the speed increases. Their length is found to increase linearly with Reynolds number until the flow becomes unstable above R=40. Fig 42. Circular cylinder at R=26 https://album-of-cfm.com/chapters/03-separation/fig42/ Fri, 18 Aug 2023 00:00:00 +0000 https://album-of-cfm.com/chapters/03-separation/fig42/ ExperimentSimulation “The downstream distance to the cores of the eddies also increases linearly with Reynolds number. However, the lateral distance between the cores appears to grow more nearly as the square root. Fig 45. Circular cylinder at R=28.4 https://album-of-cfm.com/chapters/03-separation/fig45/ Fri, 18 Aug 2023 00:00:00 +0000 https://album-of-cfm.com/chapters/03-separation/fig45/ ExperimentSimulation “Here just the boundary of the recirculating region has been made visible by coating the cylinder with condensed milk and setting it in motion through water.” Photograph by Sadathoshi Taneda Fig 46. Circular cylinder at R=41 https://album-of-cfm.com/chapters/03-separation/fig46/ Fri, 18 Aug 2023 00:00:00 +0000 https://album-of-cfm.com/chapters/03-separation/fig46/ ExperimentSimulation “This is the approximate upper limit for steady flow. Far downstream the wake has already begun to oscillate sinusoidally. Tiny irregular gathers are appearing on the boundary of the recirculating region, but dying out as they reach its downstream end. Fig 47. Circular cylinder at R=2000 https://album-of-cfm.com/chapters/03-separation/fig47/ Thu, 11 May 2023 00:00:00 +0000 https://album-of-cfm.com/chapters/03-separation/fig47/ ExperimentSimulation “Air bubbles in water show the velocity field of a flow around a circular cylinder at Reynolds number \(Re = 2000\). At this Reynolds number, there is a clear boundary layer separation followed by an oscillating turbulent wake.