## OpenFoam Simulation of Flow through a Backward Facing Step

Problem  SetUp:

Velocity  =  0.05  m/sec

Start  Time  =  0  sec

End  Time  =  1  sec

delta  Time  for  0.2  Graded  Mesh  =  0.00001  sec

delta  Time  for  0.5  Graded  Mesh  =  0.0001  sec

delta  Time  for  0.8  Graded  Mesh  =  0.0001  sec

Number of Cells in X direction  (Longer  Dimension =  200

Number of Cells in Y direction  (Each  Block =  10

OpenFoam  Solver  =  icoFoam

CONTOURS  Obtained:

Velocity  Distribution  without  Mesh:

Velocity  Distribution  with  Mesh:

Velocity  Distribution   without  Mesh:

Velocity  Distribution  with  Mesh:

Velocity  Distribution  without  Mesh:

Velocity  Distribution   with  Mesh:

PLOT  of  Velocity  Variation  @  0.085  m  from  Inlet  (for  different  Graded  Mesh):

CFL  Number:

Mean  Courant  Number  for  0.2  Graded  Mesh:  0.000325646

Mean  Courant  Number  for  0.5  Graded  Mesh:  0.00326564

Mean  Courant  Number  for  0.8  Graded  Mesh:  0.00327031

CONCLUSION:

NB:   CFL=(Velocitytimes dt)/(trianglex)

   The CFL numbers for Convergence are different for all the three Graded Mesh Simulations. For 0.2 Graded Mesh, simulation converges at delta time  =  0.00001 sec. But for 0.5 and 0.8 Graded Meshes, convergence delta time is 0.0001 sec.

OBSERVATION:

=> (delta time of 0.2 Graded Mesh) < (delta time of 0.5 Graded Mesh)=(delta time of 0.8 Graded Mesh)

So, 0.8 Graded Mesh Simulation converges at the fastest rate among all the three Graded Mesh Simulations.

Again from the above Plot, we can conclude --> Velocity Distributions are almost same for all the Graded Mesh.

### Modeling, Assembling and Drafting a Machine Vice using SolidWorks Jishnu Handique · 2018-09-08 09:12:59

Assembled  Machine  Vice:       Drafting: (1)  Clamping  Plate:     (2)  Handle  Cap:     (3)  Handle:     (4)  Jaw:     (5)  Lock Read more

### Part Assembling in NX Cad (Unigraphics) Jishnu Handique · 2018-09-08 08:41:26

(1)  Pipe  Vice:   (2)  Knuckle  Joint:   (3)  Screw  Jack:   (4)  Toy  Train  Model:   (5)  Socket  Spigot  Joint:   (6)  AirCraft  Model: &nbs Read more

### Sheet Metal and Surface Modeling in NX Cad (Unigraphics) Jishnu Handique · 2018-09-08 05:37:46

Sheet Metal Designs:       Surface Models:           Read more

### OpenFoam Simulation of Flow through a Pipe using Symmetric and Axi-symmetric Boundary Conditions and Comparison of their Results Jishnu Handique · 2018-08-21 12:28:55

(a) Symmetrically Simulated for Wedge Angle = 10 Degree, 25 Degree and 45 Degree (b) Axi-Symmetrically Simulated for Wedge Angle = 4 Degree   SCREENSHOT  of  the  25  Degree  Wedged  Pipe'  Inlet  in  ParaVi Read more

### OpenFoam Simulation of Flow through a Pipe using Axi-symmetric Boundary Condition Jishnu Handique · 2018-08-21 12:01:04

Formulae involved: a) Entry Length of a Pipe for Laminar Flow, L = 0.07*Re*D b) Velocity = (Re*mu)/(rho*Diameter) c) Hagen-Poiseuille\'s Pressure Drop, dP = -(32*mu*u_avg*L)/(D*D) Here, u_avg = u_max/2 d) Hagen-Poiseuille\'s Velocity Distribution Read more

### Finding minimum Cushion Pressure needed to break an Ice for it's different Thickness by Newton-Raphson Method in Python Jishnu Handique · 2018-08-19 07:34:42

import matplotlib.pyplot as plt import numpy as np # Functions def f(p): return pow(p,3)*(1-pow(beta,2))+(0.4*h*pow(beta,2)-sigma*pow(h,2)/pow(r,2))*pow(p,2)+(pow(sigma,2)*pow(h,4)/(3*pow(r,4)))*p-pow((sigma/3)*(pow(h,2)/pow(r,2)),3) def fprime(p) Read more

### Simulation of Flow past a Cylinder for various Reynold's Number in SolidWorks Jishnu Handique · 2018-08-19 03:40:25

TAKEN INPUTS: Diameter = 0.04 m Length = 0.1 m Density of Air = 1.225 kg/m3 Dynamic Viscosity = 18.6e-6 Pa.sec at 20 Degree Celsius Reynold No. = 20, 40, 100 We know that, Reynold No. = (Density x Velocity x Diameter)/Dynamic Viscosity By applying above inp Read more

### Simulation of Flow past a Cylinder for various Reynold's Numbers in SolidWorks Jishnu Handique · 2018-08-19 03:40:07

TAKEN INPUTS: Diameter = 0.04 m Length = 0.1 m Density of Air = 1.225 kg/m3 Dynamic Viscosity = 18.6e-6 Pa.sec at 20 Degree Celsius Reynold No. = 20, 40, 100 We know that, Reynold No. = (Density x Velocity x Diameter)/Dynamic Viscosity By applying above inp Read more

### Design and Analysis of a Centrifugal Pump in SolidWorks Jishnu Handique · 2018-07-08 15:21:32

Total  Number of Iterations  taken  for  Simulation  =  500   CUT  PLOTs  Obtained  for  Velocity: (A)  Outlet  Velocity =  10 m/sec:     (B)  Outlet  Read more