You can define the speed of the incident wave and other characteristics of the wave loading. For spherical incident wave loading, you can optionally specify the loading effects due to an UNDEX bubble. An incident wave interaction property can be referred to only by an incident wave interaction. Incident wave interaction properties that specify UNDEX data can be referred to only by incident wave interactions with an UNDEX definition. For more information, see “Defining incident waves,” Section 15.12.10.
To define an incident wave interaction property:
From the main menu bar, select Interaction
PropertyCreate.
In the Create Interaction Property dialog box that appears, do the following:
Name the interaction property. For more information about naming objects, see “Using basic dialog box components,” Section 3.2.1.
Select the Incident wave type of interaction property.
Click Continue to close the Create Interaction Property dialog box.
In the Speed of sound in fluid field, enter the sound speed in fluid, 
.
In the Fluid density field, enter fluid mass density, 
.
From the Definition field, choose the type of wave to define the incident wave property.
Select Planar to specify a planar incident wave.
Select Spherical to specify a spherical incident wave.
If you are specifying a spherical incident wave, toggle on Use UNDEX charge if you want to specify UNDEX bubble data. Click the Physical, Material, and Bubble Model tabs, and specify the following values:
Physical Data
Ratio of specific heats for gas, 
.
Acceleration due to gravity, g.
Atmospheric pressure, 
.
Flow drag coefficient, 
.
Toggle on Neglect wave effects in fluid and gas to neglect the wave effects.
Material Data
Charge material constant, K.
Charge material constant, k.
Charge material constant, A.
Charge material constant, B.
Adiabatic charge constant, 
.
Density of charge material, 
.
Mass of charge material, 
.
Bubble Model Step Data
Time duration, 
.
Maximum number of time steps for the bubble simulation, 
. The bubble amplitude simulation ceases when the number of steps reaches or the time duration, , is reached.
Relative step size control parameter, 
.
Absolute step size control parameter, 
.
Step size control exponent, 
. The step size, 
, is decreased or increased according to the error estimate: 
.
Click OK to create the incident wave interaction property and to exit the editor.
