# ACU-T: 3100 Conjugate Heat Transfer in a Mixing Elbow

## Prerequisites

Prior to starting this tutorial, you should have already run through the introductory tutorial, ACU-T: 1000 Basic Flow Set Up

## Problem Description

The problem to be addressed in this tutorial is shown schematically in Figure 1. It consists of a mixing elbow made of stainless steel with water entering through two inlets with different velocities and at different temperatures. The geometry is symmetric about the XY midplane of the pipe, as shown in the figure.

## Start HyperMesh CFD and Open the HyperMesh Database

## Validate the Geometry

The Validate tool scans through the entire model, performs checks on the surfaces and solids, and flags any defects in the geometry, such as free edges, closed shells, intersections, duplicates, and slivers.

## Set Up the Problem

### Set Up the Simulation Parameters and Solver Settings

### Create a New Material Model

### Assign Material Properties

### Assign Flow and Thermal Boundary Conditions

#### Set Boundary Conditions for the Large Inlet

#### Set Boundary Conditions for the Small Inlet

#### Set Boundary Conditions for the Outlet

#### Set Boundary Conditions for the Symmetry Planes

This geometry is symmetric about the XY midplane, and can therefore be modeled with half of the geometry. In order to take advantage of this, the midplane needs to be identified as a symmetry plane. The symmetry boundary condition enforces constraints such that the flow field from one side of the plane is a mirror image of that on the other side.

#### Set Boundary Conditions for the Outer Pipe Walls

## Generate the Mesh

## Run AcuSolve

## Post-Process the Results with HM-CFD Post

## Summary

In this tutorial, you learned how to set up a conjugate heat transfer simulation using HyperMesh CFD and how to create a new material model. You launched AcuSolve directly from HyperMesh CFD to compute the solution and then post-processed the results using the Post ribbon.