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/MAT/GAS - Airbag Gas

Description

Describes the gas molecular weight and specific heat coefficients.

Format

Type is MASS

(1)

(2)

(3)

(4)

(5)

(6)

(7)

(8)

(9)

(10)

/MAT/GAS/MASS/mat_ID/unit_ID

mat_title

MW

 

 

 

 

 

 

 

 

Cpa

Cpb

Cpc

Cpd

Cpe

Cpf

 

 

 

 

 

Type is MOLE

(1)

(2)

(3)

(4)

(5)

(6)

(7)

(8)

(9)

(10)

/MAT/GAS/MOLE/mat_ID/unit_ID

mat_title

MW

 

 

 

 

 

 

 

 

Cpa

Cpb

Cpc

Cpd

Cpe

 

Type is PREDEF

(1)

(2)

(3)

(4)

(5)

(6)

(7)

(8)

(9)

(10)

/MAT/GAS/PREDEF/mat_ID/unit_ID

mat_title

See Comment 4

 

Type is CSTA

(1)

(2)

(3)

(4)

(5)

(6)

(7)

(8)

(9)

(10)

/MAT/GAS/CSTA/mat_ID/unit_ID

mat_title

CP

CV

 

 

 

 

 

 
hmtoggle_plus1Flag Definition

Field

Contents

SI Unit Example

mat_ID

Material identifier

(Integer, maximum 10 digits)

 

unit_ID

Optional unit identifier

(Integer, maximum 10 digits)

 

mat_title

Material title

(Character, maximum 100 characters)

 

MW

Molecular weight of gas

(Real > 0)

 

Cpa

Cpa coefficient in the relation Cp(T)

(Real)

symbol_heat

Cpb

Cpb coefficient in the relation Cp(T)

(Real)

symbol_J_kg_K2

Cpc

Cpc coefficient in the relation Cp(T)

(Real)

symbol_J_kg_K3

Cpd

Cpd coefficient in the relation Cp(T)

(Real)

symbol_J_kg_K4

Cpe

Cpe coefficient in the relation Cp(T)

(Real)

symbol_J_K_kg

Cpf

Cpf coefficient in the relation Cp(T)

(Real)

symbol_J_kg_K5

CP

Specific heat at constant pressure

(Real)

symbol_heat

CV

Specific heat at constant volume

(Real)

symbol_heat
hmtoggle_plus1 Input Type Keyword

Keyword

Type of input

MASS

coefficients of Cp(T) per mass unit

MOLE

coefficients of Cp(T) per mole

PREDEF

predefined gas name

CSTA

Cp constant with temperature
hmtoggle_plus1Example (Gas)

#RADIOSS STARTER

#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|

/UNIT/1

unit for mat

                 kg                  mm                  ms

#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|

/MAT/GAS/CSTA/5/1

Nitrogen

#                 cp                  cv

               931.5               634.7

#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|

#ENDDATA

/END
hmtoggle_plus1Comments
1.If Type is MASS:

mat_gas_mass_eq

Where, Cpa is the energy per mass unit per Kelvin and Cpb is the energy per mass unit per Kelvin.

2.If Type is MOLE:

mat_gas_mole_eq

Where, MW is the molecular weight, mass per mole; Cpa is the energy per mole per Kelvin, and Cpb is the energy per mole per Kelvin.

3.If Type is CSTA, CP and CV are given per unit mass (symbol_heat).
4.The units in the database are automatically translated to the global unit system.

In the table below are names of 14 commonly used gases predefined in RADIOSS: N2, O2, Air, etc. These will be referred to by a gas material identifier, while defining INJECTOR.

Gas

Predefined Gas Name

Nitrogen

N2

Oxygen

O2

Carbon dioxide

CO2

Carbon monoxide

CO

Argon

AR

Neo

NE

Helium

HE

Hydrogen

H2

Water vapor

H2O

Ammonia

NH3

Hydrogen sulfide

N2S

Benzene

C6H6

Nitrous oxide

N2O

Air

AIR
5.Gas data is available on the NIST (National Institute of Standard and Technology) web site:

http://webbook.nist.gov/chemistry/