RADBC

Bulk Data Entry Defines the radiation boundary conditions and identifies CHBDYE entries for heat transfer analysis via radiation.

Format

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
RADBC NODAMB FAMB CNTRLND EID1 EID2 EID3 EID4 EID5
EID6 EID7 etc.

Example

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
RADBC 23 0.9 334 12 34 33

Definitions

Field Contents SI Unit Example
NODAMB Ambient point for radiation exchange identification number.

No default (Integer > 0)
FAMB Radiation view factor between the face and ambient point.

No default (Real ≥ 0)
CNTRLND Control point for radiation boundary conditions.
= 0
q=σ⋅FAMB⋅ ε e T e − T abs 4 − α e T amb − T abs 4 MathType@MTEF@5@5@+= feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyCaiabg2 da9iabeo8aZjabgwSixlaabAeacaqGbbGaaeytaiaabkeacqGHflY1 daqadaqaaiabew7aLnaaBaaaleaacaWGLbaabeaakmaabmaabaGaam ivamaaBaaaleaacaWGLbaabeaakiabgkHiTiaadsfadaWgaaWcbaGa amyyaiaadkgacaWGZbaabeaaaOGaayjkaiaawMcaamaaCaaaleqaba GaaGinaaaakiabgkHiTiabeg7aHnaaBaaaleaacaWGLbaabeaakmaa bmaabaGaamivamaaBaaaleaacaWGHbGaamyBaiaadkgaaeqaaOGaey OeI0IaamivamaaBaaaleaacaWGHbGaamOyaiaadohaaeqaaaGccaGL OaGaayzkaaWaaWbaaSqabeaacaaI0aaaaaGccaGLOaGaayzkaaaaaa@5DA9@
> 0
q=σ⋅FAMB⋅ u CNTRLND ⋅ ε e T e − T abs 4 − α e T amb − T abs 4 MathType@MTEF@5@5@+= feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyCaiabg2 da9iabeo8aZjabgwSixlaabAeacaqGbbGaaeytaiaabkeacqGHflY1 caWG1bWaaSbaaSqaaiaadoeacaWGobGaamivaiaadkfacaWGmbGaam OtaiaadseaaeqaaOGaeyyXIC9aaeWaaeaacqaH1oqzdaWgaaWcbaGa amyzaaqabaGcdaqadaqaaiaadsfadaWgaaWcbaGaamyzaaqabaGccq GHsislcaWGubWaaSbaaSqaaiaadggacaWGIbGaam4Caaqabaaakiaa wIcacaGLPaaadaahaaWcbeqaaiaaisdaaaGccqGHsislcqaHXoqyda WgaaWcbaGaamyzaaqabaGcdaqadaqaaiaadsfadaWgaaWcbaGaamyy aiaad2gacaWGIbaabeaakiabgkHiTiaadsfadaWgaaWcbaGaamyyai aadkgacaWGZbaabeaaaOGaayjkaiaawMcaamaaCaaaleqabaGaaGin aaaaaOGaayjkaiaawMcaaaaa@66DB@

Default = 0 (Integer ≥ 0)
EIDi CHBDYE element identification number(s). Keywords THRU and BY are available for alternate format listing in ascending order of EIDi.

No default (Integer > 0)

Comments

  1. For a Heat Transfer Analysis via Radiation, PARAM,TABS can be used to define the absolute temperature scale, and PARAM,SIGMA is used to specify the Stefan-Boltzmann constant. Additionally, a RADBC entry can be used to define radiation boundary conditions. Both RADM and RADBC entries are referenced on the CHBDYE Bulk Data Entry.
  2. NODAMB is treated as a black body with its own ambient temperature for radiation exchange between the surface element and space.