Project 1 Part 1

Specify Element Type and Material Properties

Specifying element type (3D)

First of all, we need to specify the element type. Select option, FLOTRAN CFD and 3D FLOTRAN142 because we are modeling the fluid in 3D.

Setting up fluid property to be those of air

There is an additional step from analysis we did using ANSYS in the past. Since we are using special software package in ANSYS called FLOTRAN, some parameters have to be specified. For example, we need to tell FLOTRAN which fluid properties we care about.

Preprocessor -> FLOTRAN Set Up -> Fluid Properties

Then you will see this window, select AIR-SI for both DENSITY and VISCOSITY. This tells the program that we are going to specify the air density and viscosity in SI unit. However, note that there is an option to vary density and viscosity. We do not need to worry about that until analysis for project 2 is required. In project 2, you will be asked to input a probablity function of viscosity. In other words, we drop the assumption that viscosity is constant regardless of temperature change, etc.

Click OK.

We can see that the conductivity and specific heat are specified to default value which is -1. Click ok.

Defining density and viscosity of air

Preprocessor -> Material Props -> Material Models

Input the density of air (1.23 kg/m^3) and viscosity (1.79*10^-5 N*s/m^2)