diff --git a/examples/telemac3d/amr/doc/amr.tex b/examples/telemac3d/amr/doc/amr.tex
index f3bc0bd2a628ca87b5e7247b45ea1d3642cfec22..096338559af83153b259975423ec9b10a1006415 100644
--- a/examples/telemac3d/amr/doc/amr.tex
+++ b/examples/telemac3d/amr/doc/amr.tex
@@ -14,7 +14,8 @@ A demonstration of the AMD method itself is presented through the test case “l
\section{Description}
For illustrative purposes we consider a point source of tracer located at the
bottom of a straight channel with rectangular cross section with a constant flow
-in the absence of friction.
+in the absence of friction (whereas it is not recommended to put a punctual
+source on the bottom for imperviousness reason).
A depth averaged velocity of 1~m/s is applied at the entrance of the channel.
At the source, the tracer concentration is arbitrarily set to 215 units,
discharged at a rate of 0.5~m$^3$/s.
diff --git a/examples/telemac3d/amr/f3d_amr.slf b/examples/telemac3d/amr/f3d_amr.slf
index da92baa2ca69176a053c7ed9429a9706bd8172ea..2bb9ded7f3cb738c80933f99dc291278e57bee1b 100644
--- a/examples/telemac3d/amr/f3d_amr.slf
+++ b/examples/telemac3d/amr/f3d_amr.slf
@@ -1,3 +1,3 @@
version https://git-lfs.github.com/spec/v1
-oid sha256:aebf5e34aa4364b24af270eaa251a158aafec2ac2a5684c3510b96738048ce43
+oid sha256:ccf2a3fbedcfcb71463ade9b66d72a9883304a5a3b4dd5e22634271bf05a0c88
size 962252
diff --git a/examples/telemac3d/amr/t3d_amr.cas b/examples/telemac3d/amr/t3d_amr.cas
index a32ca3439d7ec908bcc0eb6995ea968f213c340d..746d575415003c7efd7027610bd85cf9775b54d9 100644
--- a/examples/telemac3d/amr/t3d_amr.cas
+++ b/examples/telemac3d/amr/t3d_amr.cas
@@ -28,7 +28,7 @@ VELOCITY VERTICAL PROFILES : 2 ; 2
/--------------------------------------------------------------------
COEFFICIENT FOR HORIZONTAL DIFFUSION OF VELOCITIES = 0.1
COEFFICIENT FOR VERTICAL DIFFUSION OF VELOCITIES = 1.E-6
-MAXIMUM NUMBER OF ITERATIONS FOR DIFFUSION OF VELOCITIES = 200
+PRECONDITIONING FOR DIFFUSION OF VELOCITIES = 34
/--------------------------------------------------------------------
HORIZONTAL TURBULENCE MODEL : 1
/----------------------------------------------------------------------
@@ -46,7 +46,6 @@ MASS-BALANCE : YES
/--------------------------------------------------------------------
NUMBER OF TRACERS = 1
NAMES OF TRACERS = 'TEMPERATURE DEGREE C'
-MAXIMUM NUMBER OF ITERATIONS FOR DIFFUSION OF TRACERS = 300
COEFFICIENT FOR HORIZONTAL DIFFUSION OF TRACERS = 0.02
COEFFICIENT FOR VERTICAL DIFFUSION OF TRACERS = 1.E-6
/--------------------------------------------------------------------
@@ -54,6 +53,10 @@ DENSITY LAW : 4
BETA EXPANSION COEFFICIENT FOR TRACERS = -0.0007
STANDARD VALUES FOR TRACERS = 0.0
INITIAL VALUES OF TRACERS = 0.0
+/
+SCHEME OPTION FOR ADVECTION OF TRACERS = 1
+PRECONDITIONING FOR DIFFUSION OF TRACERS = 34
+ACCURACY FOR DIFFUSION OF TRACERS = 1.E-15
/----------------------------------------------------------------------
/ Source discharge
/------------------
@@ -66,21 +69,7 @@ ELEVATIONS OF SOURCES = -10.0
WATER DISCHARGE OF SOURCES = 0.5
VALUE OF THE TRACERS AT THE SOURCES = 215.
SCHEME FOR ADVECTION OF VELOCITIES = 5
-/
-/ PRECONDITIONING FOR DIFFUSION OF TRACERS = 34 MAY ACCELERATE
-/ BUT CHANGES THE RESULTS, TO BE LOOKED AT
-/PRECONDITIONING FOR DIFFUSION OF TRACERS = 34
-/
-/ DEFAULT VALUES UNTIL V7P3 KEPT FOR NON REGRESSION
-NON-HYDROSTATIC VERSION : NO
-ACCURACY FOR DIFFUSION OF TRACERS = 1.E-6
-/
-/ DEFAULT VALUES UNTIL V8P0 KEPT FOR NON REGRESSION
SCHEME OPTION FOR ADVECTION OF VELOCITIES = 1
-IMPLICITATION FOR VELOCITIES = 1.
-SOLVER FOR PROPAGATION = 1
-ACCURACY FOR PROPAGATION = 1.E-6
-SCHEME OPTION FOR ADVECTION OF TRACERS = 1
/
-/ DEFAULT VALUE UNTIL V8P5 KEPT FOR NON REGRESSION
-TREATMENT OF NEGATIVE DEPTHS = 1
+SOLVER FOR PPE = 1
+PRECONDITIONING FOR PPE = 34
diff --git a/examples/telemac3d/amr/t3d_sigma.cas b/examples/telemac3d/amr/t3d_sigma.cas
index d034323dce842e98948e4050d8eae4ac8b1643f9..8d10d4904d89699b69f87c314667fac7f5735ba1 100644
--- a/examples/telemac3d/amr/t3d_sigma.cas
+++ b/examples/telemac3d/amr/t3d_sigma.cas
@@ -1,86 +1,75 @@
-/
-/ ADAPTIVE MESH REFINEMENT
-/
-MESH TRANSFORMATION : 1
-/ Runs in 82 s version 6.2 13/06/2012 (Calibre 7, 8 processors)
-/--------------------------------------------------------------------
-BOUNDARY CONDITIONS FILE : 'geo_amr.cli'
-GEOMETRY FILE : 'geo_amr.slf'
-3D RESULT FILE : 'r3d_sigma.slf'
-2D RESULT FILE : 'r2d_sigma.slf'
-PREVIOUS COMPUTATION FILE : 'steadystate.slf'
-/--------------------------------------------------------------------
-TITLE : 'Source release in channel. Mixing. 21 layers. SIMA.'
-INITIAL TIME SET TO ZERO : YES
-VARIABLES FOR 2D GRAPHIC PRINTOUTS : 'U,V,H,B'
-VARIABLES FOR 3D GRAPHIC PRINTOUTS : 'Z,U,V,W,TA1'
-/--------------------------------------------------------------------
-NUMBER OF HORIZONTAL LEVELS = 21
-TIME STEP = 5.0
-NUMBER OF TIME STEPS = 3000
-GRAPHIC PRINTOUT PERIOD = 3000
-LISTING PRINTOUT PERIOD = 300
-/--------------------------------------------------------------------
-PRESCRIBED ELEVATIONS : 0.0; 0.0
-PRESCRIBED FLOWRATES : 0.0; 1000.0
-PRESCRIBED TRACERS VALUES : 0.0; 0.0
-VELOCITY VERTICAL PROFILES : 2 ; 2
-/--------------------------------------------------------------------
-COEFFICIENT FOR HORIZONTAL DIFFUSION OF VELOCITIES = 0.1
-COEFFICIENT FOR VERTICAL DIFFUSION OF VELOCITIES = 1.E-6
-MAXIMUM NUMBER OF ITERATIONS FOR DIFFUSION OF VELOCITIES = 200
-/--------------------------------------------------------------------
-HORIZONTAL TURBULENCE MODEL : 1
-/----------------------------------------------------------------------
-/mixing length model
-VERTICAL TURBULENCE MODEL : 2
-/NEZU & NAKAGAWA
-MIXING LENGTH MODEL : 3
-/Nikuradse
-LAW OF BOTTOM FRICTION : 5
-FRICTION COEFFICIENT FOR THE BOTTOM = 0.01
-/Munk & Anderson
-DAMPING FUNCTION : 3
-/--------------------------------------------------------------------
-MASS-BALANCE : YES
-/--------------------------------------------------------------------
-NUMBER OF TRACERS = 1
-NAMES OF TRACERS = 'TEMPERATURE DEGREE C'
-MAXIMUM NUMBER OF ITERATIONS FOR DIFFUSION OF TRACERS = 300
-COEFFICIENT FOR HORIZONTAL DIFFUSION OF TRACERS = 0.02
-COEFFICIENT FOR VERTICAL DIFFUSION OF TRACERS = 1.E-6
-/--------------------------------------------------------------------
-DENSITY LAW : 4
-BETA EXPANSION COEFFICIENT FOR TRACERS = -0.0007
-STANDARD VALUES FOR TRACERS = 0.0
-INITIAL VALUES OF TRACERS = 0.0
-/----------------------------------------------------------------------
-/ Source discharge
-/------------------
-/ Point discharge at (222.647, 54.499) of the model on the bed
-/ Ambient salinity 35ppt, Source salinity 250ppt
-/ Water discharge 0.5 m3/s
-ABSCISSAE OF SOURCES = 222.646987915039
-ORDINATES OF SOURCES = 54.4991149902344
-ELEVATIONS OF SOURCES = -10.0
-WATER DISCHARGE OF SOURCES = 0.5
-VALUE OF THE TRACERS AT THE SOURCES = 215.
-SCHEME FOR ADVECTION OF VELOCITIES = 5
-/
-/ PRECONDITIONING FOR DIFFUSION OF TRACERS = 34 MAY ACCELERATE
-/ BUT CHANGES THE RESULTS, TO BE LOOKED AT
-/PRECONDITIONING FOR DIFFUSION OF TRACERS = 34
-/
-/ DEFAULT VALUES UNTIL V7P3 KEPT FOR NON REGRESSION
-NON-HYDROSTATIC VERSION : NO
-ACCURACY FOR DIFFUSION OF TRACERS = 1.E-6
-/
-/ DEFAULT VALUES UNTIL V8P0 KEPT FOR NON REGRESSION
-SCHEME OPTION FOR ADVECTION OF VELOCITIES = 1
-IMPLICITATION FOR VELOCITIES = 1.
-SOLVER FOR PROPAGATION = 1
-ACCURACY FOR PROPAGATION = 1.E-6
-SCHEME OPTION FOR ADVECTION OF TRACERS = 1
-/
-/ DEFAULT VALUE UNTIL V8P5 KEPT FOR NON REGRESSION
-TREATMENT OF NEGATIVE DEPTHS = 1
+/
+/ ADAPTIVE MESH REFINEMENT
+/
+MESH TRANSFORMATION : 1
+/ Runs in 82 s version 6.2 13/06/2012 (Calibre 7, 8 processors)
+/--------------------------------------------------------------------
+BOUNDARY CONDITIONS FILE : 'geo_amr.cli'
+GEOMETRY FILE : 'geo_amr.slf'
+3D RESULT FILE : 'r3d_sigma.slf'
+2D RESULT FILE : 'r2d_sigma.slf'
+PREVIOUS COMPUTATION FILE : 'steadystate.slf'
+/--------------------------------------------------------------------
+TITLE : 'Source release in channel. Mixing. 21 layers. SIGMA.'
+INITIAL TIME SET TO ZERO : YES
+VARIABLES FOR 2D GRAPHIC PRINTOUTS : 'U,V,H,B'
+VARIABLES FOR 3D GRAPHIC PRINTOUTS : 'Z,U,V,W,TA1'
+/--------------------------------------------------------------------
+NUMBER OF HORIZONTAL LEVELS = 21
+TIME STEP = 5.0
+NUMBER OF TIME STEPS = 3000
+GRAPHIC PRINTOUT PERIOD = 3000
+LISTING PRINTOUT PERIOD = 300
+/--------------------------------------------------------------------
+PRESCRIBED ELEVATIONS : 0.0; 0.0
+PRESCRIBED FLOWRATES : 0.0; 1000.0
+PRESCRIBED TRACERS VALUES : 0.0; 0.0
+VELOCITY VERTICAL PROFILES : 2 ; 2
+/--------------------------------------------------------------------
+COEFFICIENT FOR HORIZONTAL DIFFUSION OF VELOCITIES = 0.1
+COEFFICIENT FOR VERTICAL DIFFUSION OF VELOCITIES = 1.E-6
+PRECONDITIONING FOR DIFFUSION OF VELOCITIES = 34
+/--------------------------------------------------------------------
+HORIZONTAL TURBULENCE MODEL : 1
+/----------------------------------------------------------------------
+/mixing length model
+VERTICAL TURBULENCE MODEL : 2
+/NEZU & NAKAGAWA
+MIXING LENGTH MODEL : 3
+/Nikuradse
+LAW OF BOTTOM FRICTION : 5
+FRICTION COEFFICIENT FOR THE BOTTOM = 0.01
+/Munk & Anderson
+DAMPING FUNCTION : 3
+/--------------------------------------------------------------------
+MASS-BALANCE : YES
+/--------------------------------------------------------------------
+NUMBER OF TRACERS = 1
+NAMES OF TRACERS = 'TEMPERATURE DEGREE C'
+COEFFICIENT FOR HORIZONTAL DIFFUSION OF TRACERS = 0.02
+COEFFICIENT FOR VERTICAL DIFFUSION OF TRACERS = 1.E-6
+/--------------------------------------------------------------------
+DENSITY LAW : 4
+BETA EXPANSION COEFFICIENT FOR TRACERS = -0.0007
+STANDARD VALUES FOR TRACERS = 0.0
+INITIAL VALUES OF TRACERS = 0.0
+/
+SCHEME OPTION FOR ADVECTION OF TRACERS = 1
+PRECONDITIONING FOR DIFFUSION OF TRACERS = 34
+ACCURACY FOR DIFFUSION OF TRACERS = 1.E-15
+/----------------------------------------------------------------------
+/ Source discharge
+/------------------
+/ Point discharge at (222.647, 54.499) of the model on the bed
+/ Ambient salinity 35ppt, Source salinity 250ppt
+/ Water discharge 0.5 m3/s
+ABSCISSAE OF SOURCES = 222.646987915039
+ORDINATES OF SOURCES = 54.4991149902344
+ELEVATIONS OF SOURCES = -10.0
+WATER DISCHARGE OF SOURCES = 0.5
+VALUE OF THE TRACERS AT THE SOURCES = 215.
+SCHEME FOR ADVECTION OF VELOCITIES = 5
+SCHEME OPTION FOR ADVECTION OF VELOCITIES = 1
+/
+SOLVER FOR PPE = 1
+PRECONDITIONING FOR PPE = 34
diff --git a/examples/telemac3d/amr/vnv_amr.py b/examples/telemac3d/amr/vnv_amr.py
index f6f6c4dacdfeef994bf512328811f1a5a240883a..6b2378f9d84cde0f697fc440d8206a4590778f0b 100644
--- a/examples/telemac3d/amr/vnv_amr.py
+++ b/examples/telemac3d/amr/vnv_amr.py
@@ -74,22 +74,22 @@ class VnvStudy(AbstractVnvStudy):
# Comparison with the last time frame of the reference file.
self.check_epsilons('vnv_1:T3DRES',
'f3d_amr.slf',
- eps=[1.E-5])
+ eps=[1.E-6])
# Comparison with the last time frame of the reference file.
self.check_epsilons('vnv_2:T3DRES',
'f3d_amr.slf',
- eps=[1.E-5])
+ eps=[1.E-6])
# Comparison between sequential and parallel run.
self.check_epsilons('vnv_1:T3DRES',
'vnv_2:T3DRES',
- eps=[1.E-5])
+ eps=[1.E-6])
# Comparison between sequential and parallel run.
self.check_epsilons('vnv_3:T3DRES',
'vnv_4:T3DRES',
- eps=[2.E-5])
+ eps=[1.E-6])
def _post(self):