CONV

Bulk Data Entry Defines a free convection boundary condition for heat transfer analysis through connection to a surface element (CHBDYE card).

Format

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
CONV	`EID`	`PCONID`		`CNTRLND`	`TA`

Field	Contents	SI Unit Example
`EID`	CHBDYE surface element identification number. No default (Integer > 0)
`PCONID`	Convection property identification number of a PCONV entry. No default (Integer > 0)
`CNTRLND`	Control node for time dependent convection coefficient. Default = 0 (Integer > 0)
`TA`	Ambient points used to specify ambient temperature. No default (Integer > 0)

The basic exchange relationship is expressed as: (1)
$q = (c * H) * (T - T_{A m b})$

Where,

$H$

Free convection heat transfer coefficient specified on a MAT4 entry, referred by a PCONV entry

$c$

Time-dependent multiplier provided by SPCD, which constrains node identified by CNTRLND field

$T$

Grid temperature

$T_{A m b}$

Ambient temperature
The time-dependent multiplier ( $c$ ) for the heat transfer convection coefficient is controlled via control nodes (CNTRLND field). The same nodes should be referenced on SPCD entries. Time-dependency is activated by referencing the corresponding SPCD entry on TLOAD1/TLOAD2 entries.
CONV is used with a CHBDYE entry having the same EID.
In linear steady-state heat transfer analysis, ambient temperature is specified by SPC of the TA point.
This card is represented as a secondary element in HyperMesh.