The sequence of defines for using radiation lookup tables are:
define USE_POWER_LAW_RADIATIVE_LOSSES
define USE_RADIATION_LOOKUP_TABLE
ifdef USE_RADIATION_LOOKUP_TABLE
#define RADIATION_LOOKUP_TABLE "path/filename"
endif // USE_RADIATION_LOOKUP_TABLE
Note that USE_POWER_LAW_RADIATIVE_LOSSES must still be defined. The lookup table code hijacks the power law code when USE_RADIATION_LOOKUP_TABLE is defined. This avoids making the radiation calculation in CEquations::EvaluateTerms even more complicated and messy than it already is and means that only radiation.h and radiation.cpp need be modified.
A new directory has been added: Radiation_Model/atomic_data/lookupTables/
Example file: RADYN(noHE).rad
Lookup tables have the format:
N (number of temperature and emissivity values)
M C (gradient and offset for a linear map from log10 T to array index for fast searching)
T E (T = log10 T and E = log10 emissivity [erg cm^3 s^-1])
. .
. .
. .
To search the table the starting array index is found by: index = (int)(MT + C). Temperature must be in log10 form and the temperature bins must be of equal width.
wtbarnes
commented
4 years ago
The sequence of defines for using radiation lookup tables are:
define USE_POWER_LAW_RADIATIVE_LOSSES
define USE_RADIATION_LOOKUP_TABLE
ifdef USE_RADIATION_LOOKUP_TABLE
endif // USE_RADIATION_LOOKUP_TABLE
Note that USE_POWER_LAW_RADIATIVE_LOSSES must still be defined. The lookup table code hijacks the power law code when USE_RADIATION_LOOKUP_TABLE is defined. This avoids making the radiation calculation in CEquations::EvaluateTerms even more complicated and messy than it already is and means that only radiation.h and radiation.cpp need be modified.
A new directory has been added: Radiation_Model/atomic_data/lookupTables/
Example file: RADYN(noHE).rad
Lookup tables have the format:
N (number of temperature and emissivity values) M C (gradient and offset for a linear map from log10 T to array index for fast searching) T E (T = log10 T and E = log10 emissivity [erg cm^3 s^-1]) . . . . . .
To search the table the starting array index is found by: index = (int)(MT + C). Temperature must be in log10 form and the temperature bins must be of equal width.