Basic Telemac Software Pres

2. TELEMA
C
Presented by:
Muhammad Fahim Aslam

3. TELEMAC
 This software aims at solve the Barré de Saint-Venant equations
(Shallow eqautions) on a two dimentionnal grid. It computes, on
each point of the resolving mesh, water height and averaged
velocity in vertical direction. This program is used to solve free
surface flow problems.
- Large wave propagation with the influence of the non-linear effects.-
Bottom friction.
- Influence of the Coriolis force.
- Meteorological phenomenum like atmospheric pressure and wind
effects.
- Turbulence.
- Subcritical and supercritical flows.
-Influence of the vertical gradiants of temperature and salinity.
- Dry areas in the computing domain : dry banks or floody zones.
- Current transport and dispersion of markers.

4.  The various simulation modules of the TELEMAC
system use powerful algorithms based on the finite
element or finite-volume methods.
 Space is discretised into an unstructured 2D grid of
triangular elements, so that the calculation grid can be
refined locally in areas of interest.
 The pre- and post-processing tools are particularly
powerful and user-friendly. Most of them are based on
the use of Ilog/Views libraries and offer a range of
extremely sophisticated functions. The grid can be
generated with the generator embedded in the
TELEMAC-MASCARET system (MATISSE module,
now deprecated) or by others (Blue-Kenue, Janet).

5. Purpose
 TELEMAC is a software system designed to study
environmental processes in free surface transient flows.
It is therefore applicable to seas and coastal domains,
estuaries, rivers and lakes. Its main fields of application
are in hydrodynamics, water quality, sedimentology and
water waves.
 All computational models of the TELEMAC system are
based on a common library of finite element numerical
solvers.

7. DEVELOPERS
 TELEMAC-2D was developed by the National
Hydraulics and Environment Laboratory of the Research
and Development Directorate of the French Electricity
Board (EDF-DRD), in collaboration with other research
institutes.

8. OPEN SOURCE/FREE
SOFTWARE
 All the modules of the TELEMAC system have
been open source since July 2010 and can be
downloaded on the internet site
(www.telemacsystem.com)
 Difficulties related to installation, bugs as well as
suggestions for future development are
welcome and need to be submitted through the
forum to the development team.

9. Main Applications
The main applications of the TELEMAC system software are the
following:
 Dam bursts,
 Flood studies
 Harbour installation studies (structures, jetties, breakwaters)
 Impact of hydraulic
 Estuary management and development
 Thermal recirculation
 Dumping of dredged materials
 Hydro sedimentary studies
 Wave disturbance in a port or bay
 River restoration studies
 Hydraulic studies for tourist development schemes
 Study of marine climates (generation by the wind and wave
propagation).

10. THEORICAL ASPECTS
TELEMAC-2D software solve the next four hydrodynamic equations:
- continuity :- dynamic on x :
-dynamic on y :
- markers conservation :
 on these equations, h [m] is the water level,
 u,v [m/s] the speed components,T [g/l or °] the passive marker,
 g [m²/s] the gravity,
 [m²/s] the speed diffusivity coefficients of the marker,
 Z [m] the freesurface level,
 t [s] the time
 x,y [m] the spacial coordinates.
 h,u,v and T are the unknowns. The turbulence equations are the traditionnal
k-epsilon equations.

11. PRE-PROCESSING : grid
generation
The MATISSE software is used to :
- build the geometry,
- generate the mesh,
- specify the type of boundary conditions
required.

12. POST-PROCESSING : graphics
visualization
The RUBENS software is used for producing
graphical outputs of the results from both
MATISSE and TELEMAC-2D.

13. IN AND OUT FOLDERS
 For a computation, TELEMAC-2D software needs
different folders before running the computation
and delivers others at the end the calculation.
Some of these folders are optional ones
- IN-FOLDERS:
 Parameter folder
 Mesh folder
 Boundary conditions folder
 Fortran folder
-OUT-FOLDERS:
 Result folder

14. IN-FOLDERS
Parameter folder:
 It is a text folder
 This folder is the interface between the user and the
software:
 The user decide which paramaters would be used for
the computation.
 The key-word have to be written in CAPITAL and their
respective value separate by an equality sign = or :
 The characters situated behind a "/" are not take
account for the calculation.
 The command & FIN shows the end of the folder.

15. Mesh folder
 This folder is created by MATISSE
 Can be generated by another grid editor
 Contains the mesh information
 The number of element
 The number of neighbors per element
 The matrix X and Y of the points coordinates
 Also be named as geometric folder
 Could be open with Rubens software.

16. Boundary conditions folder:
 This folder is genarated by MATISSE
 Can be modified with a text editor.
 Each line represent a boundary point.
Fortran folder:
 This folder contains all the subroutines modified by
the user.
 It must contain the princi.f program which permit to
determine the language used during the computation
interface.
 It also permit to fix the size of the computation matrix.

17. Out Folders
Result folder:
 Written in SELAFIN (binary mode, so it could
not be read by a text editor), are stocked the
computation results for step time.
 Its contents could change in function of the
value of the next key-word

18. TELEMAC-2D
 It 2D hydrodynamics module, TELEMAC-2D, solves the
so-called shallow water equations, also known as the
Saint Venant equations.
 It solves equations using finite-element or finite-
volume method and a computation mesh of triangular
elements.
 It can perform simulations in transient and permanent
conditions.
 Applications are similar as explained earlier

19. TELEMAC-3D
Uses the same horizontally unstructured mesh as TELEMAC-2D
but solves the Navier-Stokes equations
The wave formulation for the updating of the free surface is
used for efficiency.
The 3D mesh is developed as a series of meshed surfaces
between the bed and the free surface surface.
Flexibility in the placement of these planes permits the use of a
sigma grid (each plane at a given proportion of the spacing
between bed and surface) or a number of other strategies for
intermediate surface location.
In the presence of a near surface thermocline or halocline this is
advantageous in so far as mixing water between the near
surface planes, where the greatest density gradients are
located, can be avoided. When drying occurs the water depth
falls to zero exactly and the planes collapse to a zero inter-
layer spacing.

20. TELEMAC-3D - 3D
Hydrodynamics
 TELEMAC-3D is a three-dimensional (3D) model
that uses the same horizontally unstructured
mesh as TELEMAC-2D.
 The wave formulation for the updating of the free
surface is used for efficiency.
 The model mesh is developed as a series of
model planes between the bed and the surface
planes.
 The model was written primarily to solve the
shallow water equations in 3D format but an
option is also available to solve the governing
equations in a shallow water context (where
wavelengths are required to be at least twenty
times the water depth).

21. Representation of velocity vectors of a TELEMAC-3D model near Torr Head (Northern Ireland)

22. TELEMAC -3D
(A Boat in the Lock of Panama
Canal)

23. Boundary conditions
 The boundary conditions are fixed for each
border's point. They fix dependant values
compute by the software : water height, velocities,
flow
 The user could mix different sort of boundary
conditions.
 Boundary conditions could by variable in time
and/or in space.
 Q.f which fix the flow.SL.f which impose the free
surface level.
 VIT.f which impose the velocity components.

24.  The user could also impose simple boundary
conditions with key-words in the parameter folder.
 The boundary conditions folder created by
MATISSE shows for each point, the type of the
boundary choosen.
 It could be conditions of height (imposed or free),
of velocity (imposed or free) or marker
concentration imposed. The key-words relatives to
these specific conditions are:
 COTES IMPOSES,
 DEBITS IMPOSES,
 VITESSES IMPOSEES

25. Window for Boundary
Conditions

26. SOFTWARE GENERAL WINDOW
OPTIONS

27. Editor and Menu Project

28. HYDRODYNAMIC
SIMULATION
Initial conditions
 Before running a simulation, the user has to impose
initial conditions The key-word is CONDITIONS
INITIALES. The value is for this case another key-
word between :- COTE NULLE : the free surface level
is initialisated at 0 m.- COTE CONSTANTE : the free
surface level is initialisated at the value linked with the
key-word COTE INITIALE
 - HAUTEUR NULLE : the free surface level is the
bottom level.
 - HAUTEUR CONSTANTE : the height free surface
level is fixed by the key-word HAUTEUR INITIALE.
 The subroutine CONDIN.f permits to fix the height of
water level, the velocity,... on each boundary point.

29. Tools of the Software
Tools can be assessed by 3 ways
 Via Tool bar
 Via menu view
 Via the pop-up menu of view

32. Steering File Interface

33. Inter Relationship With GIS
 Data can be exported and imported from GIS
in Telemac
 Editing of Data can be done

35. Conclusion
 Useful tool for modeling
 Has vast applications
 User friendly workable window
 Exporting and Importing of Data in other
softwares is available
 Editing is easy
 Results are handy