To begin select electric fields and currents from ACDC physics, heat transfer and solids from heat transfer physics and PDE interfaces from mathematics physics. Then define the geometries by selecting geometry from the top ribbon. Proceed to define two cones with the dimensions displayed in the table on the screen.
Position the cones at the distance indicated in the table. These two cones model the two hypodermic needles used for building the bipolar radio frequency system. Duplicate the two cones to model the insulation of the needles by modifying the cone size.
Next, select a cylinder with appropriate height and diameter to model background muscle tissue placed at a Z value of minus nine millimeters while keeping the X and Y values at zero. Select another cylinder of appropriate dimensions to model the thin layer of skin placed at a Z value of four millimeters with the X and Y values at zero. Then select a sphere of appropriate diameter to model the subcutaneous tumor placed at a Z value of minus 0.5 millimeters with X and Y values at zero.
Next, right click on definitions and select functions followed by piecewise. Specify the function name and specify temperature T as the argument of the function. Type the mathematical expression for each temperature interval consistent with the displayed equations.
Repeat the steps using the nominal values listed in the displayed table to add the temperature dependent functions of blood perfusion and vascular pressure for each tissue model. To create the link with the electromagnetic thermal simulation, express the vascular pressure PV as a function of the temperature. To assign materials, properties to the geometry components, go to materials and right click to select more materials, then porous material.
Right click on porous material to select fluid and solid components. Select fluid node, and then under fluid properties, select blood. Select solid node and under solid properties, select tumor.
In the solid node, specify the volume fraction defined as theta solid. Enable manual selection and select the geometric entity corresponding to the specified material. To follow this protocol, assume that the tumor region is a pro elastic domain.
