IITians Gate Academy Forum - Recent Posts https://iitiansgateacademy.com/community/ IITians Gate Academy Discussion Board en-US Thu, 30 Apr 2026 01:33:45 +0000 wpForo 60 RE: "A viscous flow moves over a flat plate of length L. As the flow continues, the boundary layer grows quickly. At the transition point, the boundary layer thickness is δ. What is the value of the velocity potential function ɸ for this flow?" https://iitiansgateacademy.com/community/aerodynamics-flight-mechanics/a-viscous-flow-moves-over-a-flat-plate-of-length-l-as-the-flow-continues-the-boundary-layer-grows-quickly-at-the-transition-point-the-boundary-layer-thickness-is-%ce%b4-what-is-the-value-of-the/#post-10 Thu, 17 Jul 2025 16:11:52 +0000 In viscous flow over a flat plate, a boundary layer forms and grows along the plate. Inside this layer, the flow has friction and rotation. Since the velocity potential only exists in frictionless, smooth (irrotational) flow, it is not valid in this case.

So, the velocity potential function does not exist for this viscous flow.

]]> krishna Kumar https://iitiansgateacademy.com/community/aerodynamics-flight-mechanics/a-viscous-flow-moves-over-a-flat-plate-of-length-l-as-the-flow-continues-the-boundary-layer-grows-quickly-at-the-transition-point-the-boundary-layer-thickness-is-%ce%b4-what-is-the-value-of-the/#post-10 "A viscous flow moves over a flat plate of length L. As the flow continues, the boundary layer grows quickly. At the transition point, the boundary layer thickness is δ. What is the value of the velocity potential function ɸ for this flow?" https://iitiansgateacademy.com/community/aerodynamics-flight-mechanics/a-viscous-flow-moves-over-a-flat-plate-of-length-l-as-the-flow-continues-the-boundary-layer-grows-quickly-at-the-transition-point-the-boundary-layer-thickness-is-%ce%b4-what-is-the-value-of-the/#post-9 Thu, 17 Jul 2025 16:10:05 +0000 "A viscous flow moves over a flat plate of length L. As the flow continues, the boundary layer grows quickly. At the transition point, the boundary layer thickness is δ. What is the value of the velocity potential function ɸ for this flow?"

]]> krishna Kumar https://iitiansgateacademy.com/community/aerodynamics-flight-mechanics/a-viscous-flow-moves-over-a-flat-plate-of-length-l-as-the-flow-continues-the-boundary-layer-grows-quickly-at-the-transition-point-the-boundary-layer-thickness-is-%ce%b4-what-is-the-value-of-the/#post-9 elliptical orbit, Circular orbit https://iitiansgateacademy.com/community/space-dynamics/elliptical-orbit-circular-orbit/#post-8 Thu, 05 Jun 2025 02:02:56 +0000 "All natural satellites revolve in an elliptical orbit." If the statement is "true," then why do they not follow a circular orbit? Explain

]]> krishna Kumar https://iitiansgateacademy.com/community/space-dynamics/elliptical-orbit-circular-orbit/#post-8 RE: Critical Mach Number & Sonic Mach Number https://iitiansgateacademy.com/community/aerodynamics-flight-mechanics/critical-mach-number-sonic-mach-number/#post-7 Thu, 22 May 2025 03:30:13 +0000 The Critical Mach Number and the Sonic Mach Number are not the same, although they are related concepts in compressible flow.

🔹 1. Sonic Mach Number (M = 1)

 It is the Mach number at which the local flow speed equals the speed of sound.


  • Mach 1 (M = 1) is the transition point between subsonic and supersonic flow.

  • It can occur at any point in the flow field, not necessarily over the entire body.

  • This is a general term for any flow condition where velocity = speed of sound.

🔹 2. Critical Mach Number (M<sub>crit</sub>)

 It is the freestream Mach number at which some part of the airflow over an airfoil first reaches Mach 1 (sonic condition).


  • At this point, the body is still flying in subsonic conditions overall, but local supersonic regions begin to appear.

  • Important in transonic flow regimes (typically between Mach 0.75 and 1.2).

  • The critical Mach number depends on

    • Airfoil shape

    • Angle of attack

    • Compressibility effects

]]> krishna Kumar https://iitiansgateacademy.com/community/aerodynamics-flight-mechanics/critical-mach-number-sonic-mach-number/#post-7 Critical Mach Number & Sonic Mach Number https://iitiansgateacademy.com/community/aerodynamics-flight-mechanics/critical-mach-number-sonic-mach-number/#post-6 Thu, 22 May 2025 03:28:08 +0000 What is the difference between Critical Mach Number & Sonic Mach Number? Are they same?

]]> krishna Kumar https://iitiansgateacademy.com/community/aerodynamics-flight-mechanics/critical-mach-number-sonic-mach-number/#post-6 critical Velocity https://iitiansgateacademy.com/community/aerodynamics-flight-mechanics/critical-velocity/#post-3 Sun, 18 May 2025 04:33:55 +0000 what is the difference between critical velocity and critical mach number?

 

]]> krishna Kumar https://iitiansgateacademy.com/community/aerodynamics-flight-mechanics/critical-velocity/#post-3 RE: Is the stalling velocity itself the minimum velocity of the aircraft? https://iitiansgateacademy.com/community/aerodynamics-flight-mechanics/is-the-stalling-velocity-itself-the-minimum-velocity-of-the-aircraft/#post-2 Tue, 13 May 2025 13:52:11 +0000  Not Always It depends on the minimum velocity produced by the aircraft engine, As stalling velocity  is the Aerodynamic Characteristic & Minimum Velocity is the Engine characteristic.........!!

]]> Krishna https://iitiansgateacademy.com/community/aerodynamics-flight-mechanics/is-the-stalling-velocity-itself-the-minimum-velocity-of-the-aircraft/#post-2 Is the stalling velocity itself the minimum velocity of the aircraft? https://iitiansgateacademy.com/community/aerodynamics-flight-mechanics/is-the-stalling-velocity-itself-the-minimum-velocity-of-the-aircraft/#post-1 Tue, 13 May 2025 13:48:17 +0000 Is the stalling velocity itself the minimum velocity of the aircraft?

]]> Krishna https://iitiansgateacademy.com/community/aerodynamics-flight-mechanics/is-the-stalling-velocity-itself-the-minimum-velocity-of-the-aircraft/#post-1