radiation Module

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All set cards are defined in this file. This includes:

• bcs * RADM, RADBC

• views * VIEW, VIEW3D

class pyNastran.bdf.cards.thermal.radiation.RADBC(nodamb, famb, cntrlnd, eids, comment='')

Bases: ThermalBC

Specifies an CHBDYi element face for application of radiation boundary conditions

Eids()

classmethod add_card(card, comment='')

Adds a RADBC card from BDF.add_card(...)

Parameters:

cardBDFCard()

a BDFCard object

commentstr; default=’’

a comment for the card

cntrlnd

Control point for thermal flux load. (Integer > 0; Default = 0)

cross_reference(model: BDF) → None

Cross links the card so referenced cards can be extracted directly

Parameters:

modelBDF()

the BDF object

famb

Radiation view factor between the face and the ambient point. (Real > 0.0)

nodamb

NODAMB Ambient point for radiation exchange. (Integer > 0)

raw_fields()

repr_fields()

Gets the fields in their simplified form

Returns:

fieldslist[varies]

the fields that define the card

type = 'RADBC'

validate()

card checking method that should be overwritten

write_card(size: int = 8, is_double: bool = False) → str

The writer method used by BDF.write_card()

Parameters:

sizeint; default=8

the size of the card (8/16)

class pyNastran.bdf.cards.thermal.radiation.RADCAV(icavity, sets, ele_amb=None, shadow='YES', scale=0.0, prtpch=None, nefci=None, rmax=0.1, ncomp=32, comment='')

Bases: ThermalBC

Identifies the characteristics of each radiant enclosure.

1	2	3	4 | 5			6	7	8	9
RADCAV	ICAVITY	ELEAMB	SHADOW | SCALE			PRTPCH	NFECI	RMAX
	SET11	SET12	SET21 | SET22			SET31	SET32	etc.
RADCAV	1	1						.99
	3	5	4 | 5			7	5

classmethod add_card(card, comment='')

Adds a RADCAV card from BDF.add_card(...)

Parameters:

cardBDFCard()

a BDFCard object

commentstr; default=’’

a comment for the card

raw_fields()

repr_fields()

Gets the fields in their simplified form

Returns:

fieldslist[varies]

the fields that define the card

type = 'RADCAV'

write_card(size: int = 8, is_double: bool = False) → str

The writer method used by BDF.write_card()

Parameters:

sizeint; default=8

the size of the card (8/16)

class pyNastran.bdf.cards.thermal.radiation.RADLST(icavity, eids, matrix_type=1, comment='')

Bases: ThermalBC

Identifies the characteristics of each radiant enclosure.

1	2	3	4	5	6	7	8	9
RADLST	ICAVITY	MTXTYP	EID1	EID2	EID3	EID4	EID5	EID6
	EID7	etc.
RADLST	3	5	4	5	7	5

classmethod add_card(card, comment='')

Adds a RADLST card from BDF.add_card(...)

Parameters:

cardBDFCard()

a BDFCard object

commentstr; default=’’

a comment for the card

raw_fields()

type = 'RADCAV'

write_card(size: int = 8, is_double: bool = False) → str

The writer method used by BDF.write_card()

Parameters:

sizeint; default=8

the size of the card (8/16)

class pyNastran.bdf.cards.thermal.radiation.RADM(radmid, absorb, emissivity, comment='')

Bases: ThermalBC

Defines the radiation properties of a boundary element for heat transfer analysis

classmethod add_card(card, comment='')

Adds a RADM card from BDF.add_card(...)

Parameters:

cardBDFCard()

a BDFCard object

commentstr; default=’’

a comment for the card

radmid

Material identification number

raw_fields()

repr_fields()

Gets the fields in their simplified form

Returns:

fieldslist[varies]

the fields that define the card

type = 'RADM'

validate()

card checking method that should be overwritten

write_card(size: int = 8, is_double: bool = False) → str

The writer method used by BDF.write_card()

Parameters:

sizeint; default=8

the size of the card (8/16)

class pyNastran.bdf.cards.thermal.radiation.RADMTX(icavity, index, exchange_factors, comment='')

Bases: ThermalBC

Provides the Fji=Aj*fji exchange factors for all the faces of a radiation enclosure specified in the corresponding RADLST entry.

1	2	3	4	5	6	7	8	9
RADMTX	ICAVITY	INDEX	Fi,j	Fi+1,j	Fi+2,j	Fi+3,j	Fi+4,j	Fi+5,j
	Fi+6,j	etc.
RADMTX	2	1	0.0	0.1	0.2	0.2	0.3	0.2

classmethod add_card(card, comment='')

Adds a RADMTX card from BDF.add_card(...)

Parameters:

cardBDFCard()

a BDFCard object

commentstr; default=’’

a comment for the card

raw_fields()

type = 'RADMTX'

write_card(size: int = 8, is_double: bool = False) → str

The writer method used by BDF.write_card()

Parameters:

sizeint; default=8

the size of the card (8/16)

class pyNastran.bdf.cards.thermal.radiation.VIEW(iview, icavity, shade='BOTH', nbeta=1, ngamma=1, dislin=0.0, comment='')

Bases: BaseCard

Defines radiation cavity and shadowing for radiation view factor calculations.

1	2	3	4	5	6	7
VIEW	IVIEW	ICAVITY	SHADE	NB	NG	DISLIN
VIEW	1	1	BOTH	2	3	0.25

Creates a VIEW, which defines a 2D view factor

Parameters:

iviewint

Identification number

icavityint

Cavity identification number for grouping the radiant exchange faces of CHBDYi elements

shadestr; default=’BOTH’

Shadowing flag for the face of CHBDYi element - NONE means the face can neither shade nor be shaded by other faces - KSHD means the face can shade other faces - KBSHD means the face can be shaded by other faces - BOTH means the face can both shade and be shaded by other faces

nbeta / ngammaint; default=1 / 1

Subelement mesh size in the beta/gamma direction. (Integer > 0)

dislinfloat; default=0.0

The displacement of a surface perpendicular to the surface

commentstr; default=’’

a comment for the card

classmethod add_card(card, comment='')

Adds a VIEW card from BDF.add_card(...)

Parameters:

cardBDFCard()

a BDFCard object

commentstr; default=’’

a comment for the card

iview

Material identification number

raw_fields()

repr_fields()

Gets the fields in their simplified form

Returns:

fieldslist[varies]

the fields that define the card

type = 'VIEW'

write_card(size: int = 8, is_double: bool = False) → str

The writer method used by BDF.write_card()

Parameters:

sizeint; default=8

the size of the card (8/16)

class pyNastran.bdf.cards.thermal.radiation.VIEW3D(icavity, gitb=4, gips=4, cier=4, error_tol=0.1, zero_tol=1e-10, warp_tol=0.01, rad_check=3, comment='')

Bases: BaseCard

View Factor Definition - Gaussian Integration Method

Defines parameters to control and/or request the Gaussian Integration method of view factor calculation for a specified cavity.

1	2	3	4	5	6	7	8	9
VIEW3D	ICAVITY	GITB	GIPS	CIER	ETOL	ZTOL	WTOL	RADCHK
VIEW3D	1	2	2	4		1.0E-6

Creates a VIEW3D, which defines a 3D view factor

Parameters:

icavityint

Radiant cavity identification number on RADCAV entry. (Integer > 0)

gitbint; default=4

Gaussian integration order to be implemented in calculating net effective view factors in the presence of third-body shadowing. (Integer 2, 3, 4, 5, 6 or 10)

gipsint; default=4

Gaussian integration order to be implemented in calculating net effective view factors in the presence of self-shadowing. (Integer 2, 3, 4, 5, 6 or 10)

cierint; default=4

Discretization level used in the semi-analytic contour integration method. (1 < Integer < 20)

error_tolfloat; default=0.1

Error estimate above which a corrected view factor is calculated using the semi-analytic contour integration method. (Real > 0.0)

zero_tolfloat; default=1e-10

Assumed level of calculation below which the numbers are considered to be zero. (Real > 0.0)

warp_tolfloat; default=0.01

Assumed degree of warpage above which the actual value of will be calculated. (0.0 < Real < 1.0)

rad_checkint; default=3

Type of diagnostic output desired for the radiation exchange surfaces.

commentstr; default=’’

a comment for the card

classmethod add_card(card, comment='')

Adds a VIEW3D card from BDF.add_card(...)

Parameters:

cardBDFCard()

a BDFCard object

commentstr; default=’’

a comment for the card

icavity

Material identification number

raw_fields()

repr_fields()

Gets the fields in their simplified form

Returns:

fieldslist[varies]

the fields that define the card

type = 'VIEW3D'

write_card(size: int = 8, is_double: bool = False) → str

The writer method used by BDF.write_card()

Parameters:

sizeint; default=8

the size of the card (8/16)