Download ATENA Input File Format

ATENA Input File Format
269
TIME_INTEGRATION
Set type of temporal integration scheme. If this parameter is not
input, then CRANK_NICHOLSON integration will be used.
CRANK_NICHOLSON
Use linear trapezoidal integration.
THETA x
 parameter for trapezoidal integration. By default  = 0.5.
Several other linear temporal integration may be utilized
depending on the, e.g. implicit Newton integration for  = 1,
explicit integration for  = 0 etc. For good compromise between
convergence and possibility of oscillations values about  =
0.85 is recommended.
ADAMS_BASHFORTH Adams – Bashforth quadratic temporal integration.
REFERENCE_ETA eta
Damping factor.  t  dt   t   t  dt .   0.3..1  ;   1 set
totally un-damped analysis.
Default: 1
&CONVERGENCE_CRITERIA:
{ ABSOLUTE [ ERROR] | RELATIVE [ERROR] } | TEMPERATURE ERROR x |
HUMIDITY ERROR x | STEP_STOP_TEMPERATURE ERROR FACTOR x |
STEP_STOP_HUMIDITY ERROR FACTOR x |
ITER_STOP_TEMPERATURE ERROR FACTOR x | ITER_STOP_HUMIDITY
ERROR FACTOR x | NEGLIGIBLE_TEMPERATURE x | NEGLIGIBLE
_HUMIDITY x }+
Table 171: &CONVERGENCE_CRITERIA sub-command parameters
Parameter
Description
ABSOLUTE [ERROR]
The convergence criteria values are computed using the absolute
norm that is using the maximal element of an array in its absolute
value. The error is then computed by dividing an iterative value
with the value cumulated within the whole step.
RELATIVE [ERROR]
The convergence criteria values are computed using the
Euclidean norm. The error is then computed by dividing an
iterative value with the value cumulated within the whole step.
TEMPERATURE ERROR x Convergence limit for absolute value of temperature increments.
Default value is 0.01.
E.g. TEMPERATURE ERROR x
HUMIDITY ERROR x
Convergence limit for absolute value of humidity increments.
Default value is 0.01.
E.g. HUMIDITY ERROR x
STEP_STOP_TEMPERATU Factors for appropriate convergence criterion value. If a
RE ERROR FACTOR x |
convergence criterion value multiplied by the appropriate factor
STEP_STOP_HUMIDITY
exceeds the related calculated analysis error, then the execution is