3. Operands#
3.1. Operand RESULTAT#
◊ RESULTAT = mo
Name of the result object to be enriched in case of further calculation (see also ETAT_INIT).
3.2. Operand MODELE#
♦ MODELE = mo
Name of the model whose elements are the subject of thermal calculation.
3.3. Operand CHAM_MATER#
♦ CHAM_MATER = chmat
The name of the material field that is assigned on the model.
3.4. Operand CARA_ELEM#
◊ CARA_ELEM = character
The carac concept contains the characteristics of thermal shell elements, if they exist in the model.
3.5. Keyword EXCIT#
♦ EXCIT =
Operand used to define several loads. For each occurrence of the keyword factor, a load is defined, possibly multiplied by a function of time.
3.5.1. Operand CHARGE#
♦ CHARGE = tank
Charge-like concept produced by AFFE_CHAR_THER or by AFFE_CHAR_THER_F [U4.44.02].
As for mechanics, it is also possible to define a « imposed degree of freedom » type load, in this case the temperature, by AFFE_CHAR_CINE [U4.44.03].
Important note:
For each occurrence of the factor keyword EXCITles different concepts char used must be built on the same model mo.
3.5.2. Operand FONC_MULT#
◊ FONC_MULT = background
Multiplicative coefficient as a function of time (concept such as function, sheet or formula) applied to the load.
Important note:
The concomitant use of FONC_MULT with a load containing temperature-dependent thermal loads is prohibited; that is, for loadings of type ECHANGE_.
3.5.3. Operand TYPR_CALCUL#
◊ TYPE_CALCUL =/'TRAN', [DEFAUT]
/”STAT”,
The calculation is scalable if TYPE_CALCUL = “TRAN” or stationary if TYPE_CALCUL =” STAT “. In the case of an evolutionary calculation, the calculation of the initial state must be specified.
3.6. Keyword ETAT_INIT#
If TYPE_CALCUL = “TRAN”
♦ ETAT_INIT =
Allows you to define the initial field from which the evolutionary calculation is carried out.
3.6.1. Operand STAT#
/STAT = 'OUI'
The initial value of the temperature field is then the result of a previous stationary calculation.
3.6.2. Operand VALE#
/VALE = tinit
The initial temperature value is taken to be constant throughout the structure.
3.6.3. Operand CHAM_NO#
/CHAM_NO = tinit
The initial value is defined by a temperature field (result of the CREA_CHAMP [U4.72.04] operator).
3.6.4. Operand EVOL_THER#
/EVOL_THER = time
The initial value is extracted from an evol_ther data structure.
3.6.5. Operand NUME_ORDRE/INST#
◊/NUME_ORDRE = nuini_evol
/INST = instinci_evol
Order number of the field to be extracted from this data structure. Extraction of the initial thermal state in evol_ther_temp from archive number NUME_ORDRE or archive time INST to continue the calculation. If NUME_ORDRE or INST are not filled in, the last existing archived number in evol is taken.
Note:
Attention, this is the order number in the data structure read again by the keyword EVOL_THER previous. If this data structure has been calculated with a list of times different from that used under the keyword factor INCREMENT of the current resolution, it is imperative to fill in NUME_ORDRE sub INCREMENT , the same order number value corresponding to different physical times. In the case where the two lists of moments are identical, it is possible to avoid entering the same number twice NUME_ORDRE , sub ETAT_INIT and under INCREMENT .
3.6.6. Operand PRECISION/CRITERE#
Cf. [U4.71.00].
3.7. Keyword INCREMENT#
◊ INCREMENT =
Allows you to define the calculation times that determine the time intervals taken to integrate the differential equation.
The operands of the INCREMENT keyword have the same meaning as in the STAT_NON_LINE operator, see document [U4.51.03].
Note:
If the keyword INCREMENTest is absent, we create a list of moments reduced to the only real 0 in the case of a stationary calculation.
3.8. Operand SCHEMA_TEMPS#
This operand is only available in the case TYPE_CALCUL = “TRAN”.
◊ THETA =/theta, [R]
/0.57, [DEFAUT]
The theta argument is the parameter of the theta method applied to the evolutionary problem. It must be between 0 (explicit method) and 1 (completely implicit method). In the absence of the keyword, the value used is \(\theta \mathrm{=}0.57\), a bit higher than \(\theta \mathrm{=}0.5\) corresponding to the Crank-Nicholson schema. The impact of the choice of theta on the stability of the method is detailed in [R5.02.02].
3.9. Keyword SOLVEUR#
◊ SOLVEUR =
This factor keyword is optional: it defines the method for solving linear systems.
This operand is common to all global commands [U4.50.01].
3.10. Keyword ARCHIVAGE#
◊ ARCHIVAGE =
This keyword is optional: by default, all fields calculated for all calculated steps are archived in the result concept resulting from the order. It is used to store certain order numbers in a result data structure and/or to exclude certain fields from storage.
This keyword is identical to its equivalent for the STAT_NON_LINE operator, refer to the documentation [U4.51.03] for the description of the sub-keywords.
Note:
In case of stopping the calculation due to lack of time CPU, the time steps previously calculated are saved in the database.
3.11. Operand TITRE#
◊ TITRE = title
Title that we want to give to the temp result stored in the evol_ther data structure [U4.03.01].