Exhaust Port Challenge

Aim:

To perform a Conjugate heat transfer (CHT) analysis on a model of an exhaust manifold.

Conjugate heat transfer:

Conjugate heat transfer (CHT) refers to the coupling of conduction in solids with the convective and radiative heat transfer in the surrounding fluids. Accurately predicting CHT is an essential part of the design process in many industrial applications including electronics cooling, turbomachinery, and HVAC. With ANSYS CFD, the tools to perform high fidelity CHT analyses are at your fingertips.

Analysis Properties:

Under analysis properties the turbulence models and the time dependancy of the simulation are selected.

In a conjugate heat transfer simulation, the computational domain will be solved for pressure (p), velocity (U), temperature (T), and etc.

Case 1:

Baseline Mesh: 130K

Temperature Contour:

Velocity Plot:

Velocity Contour at Throat:

Wall Heat Transfer Coefficient:

Case2:

Refined Mesh: 390K

Temperature Contour:

Velocity Plot:

Velocity Contour at Throat:

Wall Heat Transfer Coefficient:

Observation:

Parameters Case1 Case2

Wall Temperature (K) 700.62 700.02

Max Velocity (m/s) 37.49 38.42

Wall Heat Transfer Cooefficient 103.07 220.15

From the above results we can conclude that refined mesh gives more accurate results than baseline resh.

Factors affecting Simulation:

1. Number of elements in mesh.

2. Inflation layers around the boundary.

3. Accurate fitting of mesh around the geometry.

4. Setting share topology.