Computed quantities for multiple convective BCs

When you specify multiple convective boundary conditions (BC) on the same selection, the thermal solver combines the computed quantities differently depending on their type.

The convective boundary conditions are the following load types:

• Thermal Convective Zone

• Thermal Stream

• Thermal Void

In the following table, i represents the ith convective BC.

Computed quantity	Combination method	Equation
Mass flow	Separate for each BC	\dot{m}_i
Fluid temperature	Separate for each BC	T_{f_i}
Fluid pressure	Separate for each BC	p_{f_i}
Heat transfer coefficient	Merged for all BCs	htc = \sum_i(h_i)
Area corrected convection coefficient	Merged for all BCs	htc_{corrected} = \sum_i(h_i F_i)
Total fluid temperature	Merged for all BCs	T_{f} = \frac{\sum_i(h_i F_i T_{f_i})}{\sum_i(h_i F_i)}
Fluid pressure on wall	Merged for all BCs	p = \frac{\sum_i(h_i F_i p_i)}{\sum_i(h_i F_i)}
Convective flux	Merged for all BCs	q = htc_{corrected} \cdot (T_{f} - T_s)
Total heat load	Separate for each BC	Q_i
Swirl velocity	Merged for all BCs	V_{\varphi} = \frac{\sum_i(h_i F_i V_{\varphi_i})}{\sum_i(h_i F_i)}

In these equations:

• hi and Fi are the specified heat transfer coefficient and correction factor for ith BC, respectively.

• pi and Vφi are the pressure and swirl velocity for ith BC, respectively.

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Computed quantities for multiple convective BCs, Simcenter 3D 2021.1 Series

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