Week 3: Flow over a backward facing step

AIM:

To run the simulation of Flow over a Backward facing step with three different base mesh sizes with help of using Converge Studio, Cygwin and Paraview and camparing the parameters.

OBJECTIVE:-

. Run 3 simulation 

. with 3 different base mesh sizes are 

1. dx = 2e-3m              dy = 2e-3m              dz = 2e-3m 

2. dx = 1.5e-3m           dy = 1.5e-3m           dz = 1.5e-3m

3. dx = 1.0e-3m           dy = 1.0e-3m            dz = 1.0e-3m

 

Contents to shown in the report:-

1. Show the mesh for all the 3 base mesh sizes

2. Show pressure and velocity contours

3. Show the plots of velocity ,pressure,mass flow rate,and totall cell counts for all the 3 base mesh sizes 

4. Also explain where and why separation is talking place in detail

 

INTRODUCTION:-

      The backward-facing step is widely used for its application of turbulences in internal flows.the flow separation is casued due to the sudden changes in the geometry and the inlet and outlet pressure values the flow separation causes a point of reattachment and a point of recirculation

      The backward - facing step represents separation flows which can be widely seen in aerodynamic flows heat transfer,engine flow, condensers vehicles and flow around the building.

Geometry:-

1. created geometry of backward facing step

2. Checking the normal

3. Checking the diagnosis in order to checks error

 

Before proceeding the error in geometry for that

View tab-diagnosis dock-default setting-select the find

Case setup:-

Application Type:- Time-Based

 

 

 

Marerial :-

Predefind mixture:- AIR

Simulation Parameters:-

 In Run Parameters Two Main Things To Be Considered

Select the following solver settings.

 Click on the Boundary to Creat Boundarys:-

 

Inlet :-

Boundary type:- INFLOW

Region name :- Region 0

 

 Outlet:-

Boundary Type :- OUTFLOW

Region name :- Region 0

 

 Top and Bottom Walls :-

Boundary Type :- WALL

Region name :- Region 0

Front 2D :-

Boundary Type :- TWO_D

Region name :- Region 0

 

BACK 2D :-

Boundary Type :- TWO_D

Region name :- Region 0

 

 Region and initialization:-

 

 

 

 Turbulence Modeling:-

 

 

 Base Grid:-

Case:- dx = 2e-3m       dy = 2e-3m            dz = 2e-3m

Case:- dx = 1.5e-3m    dy = 1.5e-3m         dz = 1.5e-3m

Case:- dx = 1.0e-3m    dy = 1.0e-3m         dz = 1.0e-3m

NOTE:- change base grid size according to your setup

 

 

 

 Fixed Embedding :-

Entity Type:- BOUNDARY

Boundary ID:- TOP AND BOTTOM WALLS

Mode :- PERMANEENT

 

 Post  Variable Selection:-

 

 

OutPut Files:-

 

 

Mesh:-

Case:- dx = 2e-3m       dy = 2e-3m            dz = 2e-3m

NOTE:- change base grid size according to your setup

Velocity Vector near Recirulation:-

 Velocity plot:-

Input and Output

 

 

 Mass_Flow_Rate Plot:-

Input and Output

 

 

 Pressures  Plot:-

Inlet and Outlet

 

 Velocity Plot:-

Inlet and Outlet

 

Total cells Counts :-

 

 

 

Mesh Grid:-

Case:- dx = 2e-3m       dy = 2e-3m            dz = 2e-3m

NOTE:- change base grid size according to your setup

Velocity Vector near Recirulation:-

 

 Mass_Flow_Rate Plot:-

Input and Output

 

 

Velocity plot:-

Input and Output

 

 Pressures  Plot:-

Inlet and Outlet

 

Total Cells Count's :-

 

 

 

mesh grid:-

Case:- dx=1.0e-3m         dy=1.0e-3m          dy=1.0e-3m

NOTE:- change base grid size according to your setup

Velocity Vector near Recirulation:-

Mass_Flow_Rate Plot:-

Input and Output

 

 Pressures  Plot:-

Inlet and Outlet

 

Velocity Plot:-

Inlet and Outlet

 Total Cells Counts:-