PCONV

Bulk Data Entry Defines a free convection boundary condition properties.

Format

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
PCONV PCONID MID FORM EXPF FTYPE H1

Definitions

Field Contents SI Unit Example
PCONID Convection property identification number of a PCONV card.

No default (Integer > 0)
MID Material property identification number of MAT4 card.

(Integer > 0)

Defaults:

If FTYPE = 3, Default = Blank

If FTYPE ≠ 3, No default
FORM Types of formula used for free convection and, also to define the reference temperature definition for temperature-dependent convection coefficient lookup. 3

If 0, 10, or 20, q = H * ( T - TAMB ) EXPF * ( T - TAMB )

If 1, 11, or 21 q = H * ( T EXPF - TAMB EXPF )

Where, T MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamivaaaa@36CF@ is grid temperature and TAMB MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaaeivaiaabg eacaqGnbGaaeOqaaaa@3926@ is the ambient temperature.

Default = 0 (Integer)
EXPF Free convection exponent.

If FORM = 0, 10, or 20, EXPF = 0.0 for linear convection.

If FORM = 1, 11, or 21, EXPF = 1.0 for linear convection.

Therefore, linear convection formula is: q = H * ( T - TAMB )

FTYPE Convection Coefficient definition type.
0
The Convection Coefficient is specified on the MAT4 Bulk Data Entry referenced on the MID field
3
The Convection Coefficient is specified in the H1 field. The Convection Coefficient on the MAT4 Bulk Data Entry referenced in the MID field is ignored.

No default (Integer)
H1 Free Convection Coefficient value (for FTYPE=3).

Defines the Free Convection Coefficient value, if FTYPE=3.

No default (Real ≥ 0.0)

Comments

  1. Every CONV card must refer a PCONV card.
  2. Heat transfer coefficient (H) is specified on MAT4 card with MID.
  3. In Nonlinear Heat Transfer, to define the reference temperature definition for temperature-dependent convection coefficient lookup, the FORM field can be used as:
    FORM
    Reference Temperature Description
    0 or 1 (Default)
    Reference Temperature is the average of:
    • Element grid point temperatures (average), and
    • Ambient point temperatures (average)
    10 or 11
    Reference temperature is the surface temperature (average of element grid point temperatures)
    20 or 21
    Reference temperature is the ambient temperature (average of ambient point temperatures).
  4. This card is represented as a group in HyperMesh.