4.7. Defining Material Properties for the Fluid

You will now specify the fluid properties, using the Material data menu item.

  Material data

For this problem, you will define only the viscosity of the material. Select Shear-rate dependence of viscosity, and then choose the Cross law. You will need to specify three parameters for the Cross law: , , and . See Cross Law for details about the Cross Law and its applicability.

Specify the value for .

  Modify fac

Enter 85000 Poise as the New value (Figure 4.12: Specifying the Value of the First Parameter for the Cross Law) and click OK.

Figure 4.12: Specifying the Value of the First Parameter for the Cross Law

Specifying the Value of the First Parameter for the Cross Law

Next, specify the value for .

  Modify tnat

Enter 0.2 seconds as the New value (Figure 4.13: Specifying the Value of the Second Parameter for the Cross Law) and click OK.

Figure 4.13: Specifying the Value of the Second Parameter for the Cross Law

Specifying the Value of the Second Parameter for the Cross Law

Finally, specify the value for .

  Modify expom

Enter 0.3 as the New value (Figure 4.14: Specifying the Value of the Third Parameter for the Cross Law) and click OK.

Figure 4.14: Specifying the Value of the Third Parameter for the Cross Law

Specifying the Value of the Third Parameter for the Cross Law

Check that the values of the constants are correct at the top of the Cross law menu, and repeat the previous steps if you need to modify the constants again. Then click Upper level menu three times to complete the material data specification. Ansys Polydata will highlight the Flow boundary conditions menu item for you.