Week 1- Mixing Tee

Mixing Tee

Objective:

For this challenge, we have created two versions of the mixing tee. One of them is longer than the other.

The job is to set up steady-state simulations to compare the mixing effectiveness when hot inlet temperature is 36⁰C & the Cold inlet is at 19⁰C.

Using the k-epsilon and k-omega SST model for the first case

Later choose the right model among both for second case

Ansys set up:

Import the Geometry and clean for requirements like creating volume extraction to be simulated

Meshing :

Mesh the required geometry with appropriate element size and finally naming them for boundary conditions

Fluent set up:

solver type- pressure based,

time - steady state,

velocity - Absolute

Viscous model - K-epsilon and k-omega choosen for case 1

Mterial type - air

boubary canditions - inlet velocity hot side 3m/s

inlet velocity cold side 6m/s and 12m/s

cell zone - fluid zone.

1. Case 1
   • Short mixing tee with a hot inlet velocity of 3m/s.
   • Momentum ratio of 2, 4.

K-epsilon model.

Mom at 4

K-omega model

Case 1 Table:

				cell count	STD DEVTEMP	average outlet temp	no of ietration		STD DEVTEMP	average outlet temp	no of ietration
short tee	K-epsilon	case 1	mom2	14139	1.7099899	30.234035	212	k-omega	1.5128709	30.274801	193
			mom4	14139	1.3357867	27.54858	146		1.1339424	27.520073	206

Case 2

K - epsilon is taken for second case simulations come with less no of ieteration compared to k-omega

At mom 2

At mom 4

long tee	K-epsilon	case 2	mom2	17901	0.91904567	30.302184	472
			mom4	17901	0.53807975	27.492689	127

Grid Test

Grid size is 5mm

14139

Grid size 4mm

cell count

21776

conclusion

When no of cells are incresed results will get accurete and simulations come very appropriate and can expect required physics behind the flow