Heat Exchange

In interface TYPE7 there are three heat exchanges: heat transfer, radiation and heat friction are allowed by I_the=1.

For heat transfer between secondary and main with Iform_the, two different heat transfer can be defined. One is set constant temperature in interface where, heat exchange is only between this interface and shell secondary side. The other is heat exchange between all pieces in contact.

If Frad≠ 0, then radiation is computed inside of distance Drad(max. distance for radiation computation). It is recommended to not set too high of a value for Drad , otherwise Radioss Engine performance may be reduced.

Using Fheat_s and Fheat_m frictional sliding energy will be converted into heat. Since friction heat is divided between secondary and main side, generally Fheat_s + Fheat_m < 1.0. The frictional heat Q_Fric is defined:

If I_form=2 (a stiffness formulation):

Secondary side: (1)

Q_{F r i c} = F h e a t_{s} \cdot \frac{(F_{a d h} - F_{t})}{K} \cdot F_{t}

Main side: (2)

Q_{F r i c} = F h e a t_{m} \cdot \frac{(F_{a d h} - F_{t})}{K} \cdot F_{t}

(Ithe_form=1)

Here, K is contact stiffness $F_{a d h}$ is adhesive force.

If I_form=1 (a penalty formulation):

Secondary side: (3)

Q_{F r i c} = F h e a t_{s} \cdot C \cdot V_{t}^{2} \cdot d t

Main side: (4)

Q_{F r i c} = F h e a t_{m} \cdot C \cdot V_{t}^{2} \cdot d t