Problem 9. Assume that we want to model a recirculating flow happens at the downstream of a step as shown in the following sketch. (a) Specify the position of reattachment point and the appropriate distance of the outflow boundary layer, as a function of step height, h. (b) Determine all of the required boundary conditions for turbulent parameters (k and D) in each boundary. (c) Which turbulence model do you suggest to solve this problem? h ? ?

Problem 9. Assume that we want to model a recirculating flow happens at the downstream of a step as shown in the following sketch. (a) Specify the position of reattachment point and the appropriate distance of the outflow boundary layer, as a function of step height, h. (b) Determine all of the required boundary conditions for turbulent parameters (k and D) in each boundary. (c) Which turbulence model do you suggest to solve this problem? h ? ?

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

Question 3 a) Neglecting freestream turbulence, the decelerating freestream velocity profile over a flat plate is given by, u = u₁ (1-x/L)", with L=10m. i) Estimate the point where the separation occurs, for n=1,2,3,4. ii) Consider the case when n=2 and estimate the momentum thickness at the separation point by the Walz-Thwaites's method. iii) Use Michel's method (after 1 iteration) to predict transition when u₁ = 10m/s and obtain an equation for the location of the transition point, x,,. State the assumption that was made to obtain the result. iv) Is x,, upstream or downstream of the point where separation occurs? b) If u is unknown, using Michel's formula for transition, find the value of u₁ = u₁_col that both separation and transition occur at the point of separation. (i.e. the two points are co-located.) such When, u > u₁_col, state whether the transition point x, is upstream (towards the leading edge) or downstream (towards the trailing edge) of the point where separation occurs?…
need correct and urgent
Need help with this engineering problem.
Please write down a related Average Nusselt number equation for each case. (Do not calculate) Laminar flow SCHEMATIC: Air 4∞ = 2 m/s Top = 25°C p = 1 atm w= 0.2 m L=25 AL 0.25 m T = 500 °C ASSUMPTIONS: (1) Top surface is smooth, (2) Bottom surface is adiabatic, (3) Critical Reynolds number is 5 × 105, (4) Negligible radiation.
INTERNAL COMBUSTION ENGINESplease write clearly
For each statement, choose whether the statement is true or false, and discuss your answer briefly. (a) The velocity potential function can be defined for threedimensional flows. (b) The vorticity must be zero in order for the stream function to be defined. (c) The vorticity must be zero in order for the velocity potential function to be defined. (d) The stream function can be defined only for two-dimensional flow fields.
i need answer quickly
Problem-2 For the turbulent incompressible boundary layer, the velocity profile is given as u/Ue, y = y/8, Ue and d are boundary-layer edge velocity where, u = and boundary layer thickness, respectively. Using momentum integral equation, prove that: 8/x = 0.383/Re,/5 8% /x = 0.0479/Re/5 and 0/x = 0.0372/Re/5
In the flow of air at 20°C and 1 atm past a flat plate inFig. , the wall shear is to be determined at position x bya floating element (a small area connected to a strain-gageforce measurement). At x = 2 m, the element indicates ashear stress of 2.1 Pa. Assuming turbulent flow from the leadingedge, estimate (a) the stream velocity U, (b) the boundarylayer thickness δ at the element, and (c) the boundary layervelocity u, in m/s, at 5 mm above the element.
Question 11) Vortices are usually shed from the rear of a cylinder, which are placed in a uniform flow at low speeds. The vortices alternatively leave the top and the bottom of the cylinder, as shown in figure, causing an altemating force normal because of generating a dimensionless relationship for Kánmán vortex shedding frequency f (1/s) as a function of free-stream speed V(7m/s), fluid density p (kgm³), fluid viscosity µ (kg/m.s), sound velocity c (m/s), surface roughness & (m) and cylinder diameter D(m). || I-Determine the nondimensional a parameters using repeating variables, involving f, , c and u as nonrepeating variables ii-the dynamics of Bhosphorus bridge is investigated in a wind tunnel for the vortex generation behind the wires. A 1/59 scaled down model of the hanging wires is used in the laboratory. If vortex shedding frequency of of Bhosphorus bridge 590 Hz is measured in the laboratory at 29 m/s. Then detemine the expected frequency in the actual case exposed to 190 km/h…
Please do it on priority
When fluid in a long pipe starts up from rest at a uniformacceleration a , the initial flow is laminar. The flow undergoesa transition to turbulence at a time t * which depends, tofirst approximation, only upon a , ρ , and μ . Experiments by P. J. Lefebvre, on water at 20 8 C starting from rest with 1-gacceleration in a 3-cm-diameter pipe, showed transition att * = 1.02 s. Use this data to estimate ( a ) the transition timeand ( b ) the transition Reynolds number Re D for water flowaccelerating at 35 m/s 2 in a 5-cm-diameter pipe.