Q. How to define a energy source (sink) such that a specified temperature is maintained in the sub-domain?

A. Set an Energy Source term in the required subdomain in the following form:

Source = -C*Cp*(T-Tspec)

where C is a large number (example 10E+8[kg m^-3 s^-1]), Cp is the specific heat capacity of the fluid, T is the local temperature and Tspec is the temperature that needs to be maintained in the sub-domain.

The following CEL demonstrates how to implement this in CFX 5. (NOTE the value of the 'Source Coefficient' in the definition of the sub-domain source)

CEL:
EXPRESSIONS:
Constant = 10E+8 [kg m^-3 s^-1]
Tspec = 300 [K]
heatsink = -Constant *Specific Heat Capacity at Constant Pressure *( T - Tspec)
END
END

SUBDOMAIN: sink
Coord Frame = Coord 0
Location = B41
SOURCES:
EQUATION SOURCE: energy
Option = Source
Source = heatsink
Source Coefficient = -Constant*Specific Heat Capacity at Constant Pressure
END
END
END


Q. How to define a energy source (sink) such that a specified temperature is maintained in the sub-domain?

A. Set an Energy Source term in the required subdomain in the following form:

Source = -C*Cp*(T-Tspec)

where C is a large number (example 10E+8[kg m^-3 s^-1]), Cp is the specific heat capacity of the fluid, T is the local temperature and Tspec is the temperature that needs to be maintained in the sub-domain.

The following CEL demonstrates how to implement this in CFX 5. (NOTE the value of the 'Source Coefficient' in the definition of the sub-domain source)

CEL:
EXPRESSIONS:
Constant = 10E+8 [kg m^-3 s^-1]
Tspec = 300 [K]
heatsink = -Constant *Specific Heat Capacity at Constant Pressure *( T - Tspec)
END
END

SUBDOMAIN: sink
Coord Frame = Coord 0
Location = B41
SOURCES:
EQUATION SOURCE: energy
Option = Source
Source = heatsink
Source Coefficient = -Constant*Specific Heat Capacity at Constant Pressure
END
END
END





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