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AIM: to set up steady-state simulations to compare the mixing effectiveness when the hot inlet temperature is 360C & the Cold inlet is at 190C creating two versions of the mixing tee. OBJECTIVE: is to set up steady-state simulations to compare the mixing effectiveness when the hot inlet temperature…
Dhanu Manthri
updated on 11 Oct 2022
AIM: to set up steady-state simulations to compare the mixing effectiveness when the hot inlet temperature is 360C & the Cold inlet is at 190C creating two versions of the mixing tee.
OBJECTIVE:
Case 1
Geometry:
The Geometry has been provided in the challenge interface. The first case is simulated with the short T-joint with the momentum ratio 2.
Meshing:
We have done mesh refinement by an element size = 0.002m and keeping the rest of it default
element quality
number of elements and nodes
After creating the Mesh file, we name the geometry
1. Inlet x
2. Inlet y
3. The walls
4. Outlet
After updating the mesh file we go to the solution part.
Solution;
SETUP |
Short TEE (MR=4 & Inlet Hot Velocity=3m/s) |
|
K-epsilon |
K-omega |
|
Solver Type |
Pressure Based |
Pressure Based |
Velocity Formulation |
Absolute |
Absolute |
Time |
Steady |
Steady |
Viscous Model |
Realizable k-epsilon with standard wall function |
k-omega SST model |
Material |
Air |
Air |
Cell zones Volume_volume |
Fluid type: Air |
Fluid type: Air |
Boundaries |
Inlet x (velocity inlet) Velocity Magnitude 3m/s Temperature – 36 degrees c. Inlet y (velocity inlet) Velocity Magnitude 6m/s Temperature – 19 degrees c. Outlet x (Pressure outlet) Gauge Pressure – 0 pas. Walls – Stationary walls |
Inlet x (velocity inlet) Velocity Magnitude 3m/s Temperature – 36 degrees c. Inlet y (velocity inlet) Velocity Magnitude 6m/s Temperature – 19 degrees c. Outlet x (Pressure outlet) Gauge Pressure – 0 pas. Walls – Stationary walls |
Left being k-epsilon and the right being the k-omega
Residuals Plot
Average weighted area Plot to find the outlet Temperature
Standard Deviation Plot to find the Effectiveness of Mixing at the outlet
Average weighted area Plot to find the outlet Velocity
Countor Plot
for Temperature distribution
For Velocity Distribution
Subcase 2:
For velocity of hot air 3m/s and cold air 12m/s
In which geometry and the mesh is the same as the previous one. Only the solution part changes i.e, the boundary conditions where the inlet y changes from 6 to 12 m/s
SETUP |
K-epsilon |
|
Solver Type |
Pressure Based |
|
Velocity Formulation |
Absolute |
|
Time |
|
|
Viscous Model |
Realizable k-epsilon with standard wall function | |
Material |
Fluid type: Air | |
Cell zones Volume_volume |
Fluid type: Air | |
Boundaries |
Inlet x (velocity inlet) Velocity Magnitude 3m/s Temperature – 36 degrees c. Inlet y (velocity inlet) Velocity Magnitude 6m/s Temperature – 19 degrees c. Outlet x (Pressure outlet) Gauge Pressure – 0 pas. Walls – Stationary walls |
Residuals Plot
Average weighted area Plot to find the outlet Temperature
Standard Deviation Plot to find the Effectiveness of Mixing at the outlet
Average weighted area Plot to find the outlet Velocity
Countor Plot
For Temperature distribution
For Velocity Distribution
CASE 2:
Geometry;
The Geometry has been provided in the challenge interface. The first case is simulated with the short T-joint with the momentum ratio 2.
Meshing:
We have done mesh refinement by an element size = 0.002m and keeping the rest of it default
element quality
the number of elements and nodes
After creating the Mesh file, we name the geometry
1. Inlet x
2. Inlet y
3. The walls
4. Outlet
After updating the mesh file we go to the solution part.
Solution
SETUP |
K-epsilon |
|
Solver Type |
Pressure Based |
|
Velocity Formulation |
Absolute |
|
Time |
|
|
Steady |
||
Viscous Model |
Realizable k-epsilon with standard wall function | |
Material |
Fluid type: Air | |
Cell zones Volume_volume |
Fluid type: Air | |
Boundaries |
Inlet x (velocity inlet) Velocity Magnitude 3m/s Temperature – 36 degrees c. Inlet y (velocity inlet) Velocity Magnitude 6m/s Temperature – 19 degrees c. Outlet x (Pressure outlet) Gauge Pressure – 0 pas. Walls – Stationary walls |
Residuals Plot
Average weighted area Plot to find the outlet Temperature
Standard Deviation Plot to find the Effectiveness of Mixing at the outlet
Average weighted area Plot to find the outlet Velocity
Counter Plot
Temperature distribution
Velocity Distribution
The flow of air in a pipe animation:
CONCLUSION
SHORT TEE ;
https://drive.google.com/file/d/1MPAlrd0HkBezpnEkNBxmnprNqf8pHLOu/view?usp=sharing
LONG TEE;
https://drive.google.com/file/d/1GpRKr3JPzUjtvdi772vXosttjFk_UdlB/view?usp=sharing
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