Introduction


* red  words are TACITE's reserved words

What does TACITE do ?

TACITE is able to solve transient two-phase flow in pipes. It is dedicated to oil engeneering.
TACITE allows vertical, oblic and horizontal flow computation.
TACITE uses a 1D instationary model. The mesh is composed of adjacent cylinders (cells) forming the pipe.
TACITE simulates dispersed, stratified, anular, and intermittent flows. Hydrodynamic transient as well as thermal transient can be performed. Influence of pipe equipments such as valves, relief valves, pumps can be taken into acount.
A simplified composition with N(N=2..12) pseudo-components is used to describe the fluid. It incomes to the user to specify components caracteristics in order to represent the real fluid.
 
 

Introducing to TACITE

Since no source code is available ,TACITE 4.009 is a black box because composed of only one executable file named tacite.out.
The paramters transmission is done with editing ASCII files. After a computation TACITE output is composed of some ASCII or binary files reporting :
         -The simulation parameters files

        - The restart file

                      - The results files


The file naming use a  generic name defined by the user followed by specific extentions . We use SimName as the example generic name.
 
 
 
 
 

The simulation parameters files :

These files are the copy of which were used to perform the simulation.The sufix   _# , where # is the number of  the last simulation using the same generic name, is appended to the generic name in order to name successive similar simulations. It may be used when only slight modifications to the parameters files are done.
As an example, the result of a sequence of 3 simulations modifying some of the SimName.* parameters files is the set of folowing files :
SimName_1.*    SimName_2.*    SimName_3.*

When performing an other version of a simulation, followng parameters files are created.
SimName_#+1 SimName_#+1.GEO SimName_#+1.MSH  SimName_#+1.PVT    SimName_#+1.SCE  SimName_#+1.STO  SimName_#+1.THE    SimName_#+1.TOP
The content of these files is concatenated in tow files :
SimName.TIT and SimName.REP
 

*Note that the simulation number (=job number) is stored in the SimName.JNB file.
 
 
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The restart file :

SimName.RTT
This ASCII file created at the end of the simulation contains all the static and thermodynamic data that are needed to restart the simulation if any.
 
 
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The results files

Binary or ASCII files as specified in SimName.STO file.

SimName_#.XV : Store only space dependent variable i.e. the topology  and section area distributuion.
SimName_#.XN : organization and nomenclature of SimName_#.XV file.
SimName_#.TV : Store only the time dependent variables
SimName_#.TN : organization and nomenclature of SimName_#.TV  file.
SimName_#.TXV : Store  the space-time dependent variables                          -> Output data mangement
SimName_#.TXN : organization and nomenclature of SimName_#.TV  file.
 
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Space dependant variables : Structure of the SimName_#.XV file

*International system untit
 
Abscice
Absolute elevation
Cross section area
X1
elev1
A1
X2
elev2
A2
...
...
...
pipe length
elevN
AN

Time dependant variables : Structure of the SimName_#.TV file

*International system untit
 
Time
(0<T<Tk)
Cumulative produced gas mass
Cumulative produced liquid mass
Total gas volume
Total liquid volume
Total gas mass
Total liquid mass
Total mass of component 1
Total mass of component i     (1<i< n)
.............
Total mass of component n
0
                 
T1
                 
...
                 
Tk
                 

Time-Space dependant variables : Structure of the SimName_#.TXV file

*International system untit
 
 
Time
(0<T<Tk)
Abscice
(0<X<XN)
Flow patern
Slug fraction
Pressure
Temperature
Gas volumetric fraction
Liquid volumetric fraction
Superficial gas velocity
Superficial liquid velocity
Gas mass flow rate
Liquid mass flow rate
Mass flow rate of comp 1
Mass fraction of comp 1 in gas
Mass fraction of comp 1 in liquid
 Mass flow rate of comp i
..........
 Mass fraction of comp i in gas
.............
Mass fraction of comp i in gas 
............
 .......
 Mass fraction of comp n in gas
0
 X1
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 0
 ...
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 0
 XN
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 ...
... 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 Tk
X1 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 Tk
 ...
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 Tk
 XN
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

 
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Content of SimName.TIT

 

Here is the content of the SimName.REP (well_20.REP) :

 *********************************************
 *****                                   *****
 *****            T A C I T E            *****
 *****            -----------            *****
 *****                                   *****
 *****      Transient Analysis Code      *****
 *****                                   *****
 *****         IFP - TOTAL - ELF         *****
 *****                                   *****
 *********************************************

 TACITE version: 4.099

 *********************************************

 Date and time: 12/11/99 11h30am
 well_20

 *********************************************

 Title:
    welltoplant
 Commentaries:

 *********************************************

 Topography file
 ===============
0.d0        0.d0
20.d0       20.d0
1000.d0     20.d0
5000.d0     25.d0

 Geometry file
 =============
PIPE
0.d0         0.2d0     10d-5
!!1000.0d0      0.2d0       10-5
!!6000.0d0       0.1d0      10d-6
EQUIPMENT
so1      1       0.d0
si1      2       5000.0d0
rv1      5       15.0d0    0.05d0
valv2    3       4900.0d0    0.9d0    1
!!wpump    6       1000.0d0
!!PUMP
!!50.d0    0.d0    100.d0
!!1.d0
!!1    1
!!0.05d0   0.14d0 0.10d0  0.5

 Thermic file
 ============
1
0.        310.
5000.    300.

 Mesh file
 =========
GRID
X=0.d0     NB=10
X=50.d0   NB=50

 PVT properties file
 ===================
5                       ! Type: 1=correlations
1d5        300d0        ! normal pressure and temperature
1.00d0                  ! TPN gas density
1.5d-5                  ! TPN gas viscosity
1000d0                  ! TPN liquid density
1.5d-6                  ! TPN liquid viscosity
70d-3                   ! TPN interfacial stress
1400d0                  ! Specific Heat of Gas
1500d0                  ! Specific Heat of Liquid
3d-2                    ! Gas conductivity
0.14d0                  ! Liquid conductivity
0d0                     ! ki1
0d0                     ! ki2

 Scenario file
 =============
STABILIZE = 120
STOP_TIME = 10

EQUIPMENT = so1
---------------
UPST_COMP1
T=0                     BC=0.2
T=T+2                   BC=0.3
UPST_COMP2
T=0                     BC=20.
T=T+2                   BC=25
EQUIPMENT = si1
---------------
DOWN_PRES
T=0                     BC=10d5

EQUIPMENT = rv1
-----------------
SOUP_PRES
T=0                     BC=10d5
T=T+2                   BC=5d5
EQUIPMENT = valv2
-----------------
VALV_OPEN
T=0                     BC=50d0
T=T+2                   BC=100d0
T=T+4                   BC=50d0

 Storage file
 ============
PERIOD=1
STYLE=ASCII

 Options file
 ============
 

 *********************************************

 Program stopped
 (5555)  TACITE: Scenario completed

 *********************************************

    CPU time           =    1288.38

    Nb of time steps   =  718
    Nb of cells        =  120

    CPU time/time step =    1.79440
    CPU time/cell      =    1.49533E-02

 *********************************************
 


 
 
 
 
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Here is the content of the SimName.TIT

The structure of the file is :
line 1 :         Titlte of the simulation
line 2 :         Version of TACITE used
line 3 :         Date and time (copied from the TACITE.JOB file)
line 4 :         SimName (Generic name)
line 5 :         Job number (_#)
lines 6-8 : Optional , coment or notes conserning the simulation

Example: well_20.TIT

welltoplant
 4.099
 12/11/99 11h30am
 well
   20