Conjugate Heat Transfer simulation-PipeFlow

Flow simulation was setup up using Converge Studio, and post processing was carried out in Paraview.

Inlet Reynold number-10000

Inflow velocity- 5m/s

Turbulence model- K-epslon model

Super-cycling modelling was carried out for overcoming time-scale disparity. In super-cycling, the fluid solver is frozen periodically while the heat transfer in the solid is allowed to progress to steady-state. CONVERGE solves the fluid and solid phases in the same simulation without requiring you to stop and restart the simulation. Super-cycling significantly reduces the computational cost of the CHT simulation.

1. Base grid: 0.004 m. (Velocity and Temperature Plots)

Temperature vs time- at the selected point near outflow of pipe:

Vector Plot:

2. Base grid: 0.006m.

Temperature vs Time at selected outflow point:

It looks like, varying the grid size, did effect the converged value of temperature to an extent (about 2-3%).

3.Base Grid: 0.002m.

Temp vs time for outflow selected point:

Now when the grid size is decreased, the effect on the converged results is bit substantial (about 12% variation).

4. Effect of Supercyclic stage interval on simulation time:

interval--0.03:

Time:1077 secs approx.

interval-0.02:

Time: 1485 seconds approx

interval-0.01

Time: 2178 secs. approx

With decrease in cycling interval, simulation time increased which was expected, because fluid scale solver is frozen more periodically, as periodic interval is less.