**convection_heat_flux

Description

The **convection_heat_flux BC imposes a convective heat flux on a line set in 2D or a face set in 3D:

(47)\[q_c=a(T-T_e)\]

where \(q_c = - K \vect{\nabla T} . \vect n\) is the outflow flux, \(a\) the convection coefficient, \(T_e\) the exterior temperature and \(\vect n\) the outward normal (note that the actual liset or bset alignment is not taken into account).

This keyword replaces the now deprecated keyword **fluconv.

Syntax

**convection_heat_flux  group \(~\,~\,\) h \(a\) \(~\,~\,\) Te Te table

group

Character name for the group of line sets in 2D or face sets in 3D where the flux condition is to be applied.

a

Real value for the convection coefficient.

Te

Real value for the exterior temperature \(T_e\).

table

Character name of the table describing the flux value in time (see ***table).

The coefficient \(a\) may depend on the temperature for this condition. The syntax required for a convection heat flux condition with this dependence is given below:

**convection_heat_flux group \(~\,~\,\) h temperature \(~\,~\,\) h0   T0 \(~\,~\,\) h1   T1 \(~\,~\,\) h2   T2 \(~\,~\,\) … \(~\,~\,\) Te   Te table

The keyword **convection_heat_flux and the two following lines must be repeated as many times as there are convective flux boundary conditions.

Example

**convection_heat_flux myliset
  h   100.0
  Te  -10. table1