diff --git a/examples/telemac3d/Viollet/doc/Viollet.tex b/examples/telemac3d/Viollet/doc/Viollet.tex
index 8745800965448725a511ce08789187d0c82e3e39..5601fdf5f2b6ad49bbba4a0c3bf228efac232b55 100644
--- a/examples/telemac3d/Viollet/doc/Viollet.tex
+++ b/examples/telemac3d/Viollet/doc/Viollet.tex
@@ -121,11 +121,22 @@ The non-hydrostatic version is used.
To solve the advection, the N-type MURD (scheme 4) is used for the velocities,
temperature and $k$-$\epsilon$.
-The default solvers (GMRES for propagation and PPE, conjugate gradient for
-diffusion of velocities, tracers and $k$-$\epsilon$) are used.
+The default solvers (GMRES for propagation, conjugate gradient for
+diffusion of velocities, tracers and $k$-$\epsilon$) are used
+except for PPE for which conjugate gradient is chosen for more efficiency.
+To accelerate computation, preconditioning 34 = 2 $\times$ 17 (i.e. diagonal
+combined with direct solver on the vertical) is chosen for every operation
+solved by conjugate gradient and for which it is enabled (diffusion of
+velocities, tracers, $k$-$\epsilon$, PPE).
For every solving operation, asked accuracy is quite fine
-(from 10$^{-16}$ for temperature and $k$-$\epsilon$ to 10$^{-16}$ for PPE and
+(from 10$^{-16}$ for temperature and $k$-$\epsilon$ to 10$^{-12}$ for PPE and
propagation steps).
+\\
+
+Mass conservation is improved (up to machine precision for water depth) by using
+default values for keywords \telkey{TIDAL FLATS} (= YES) and
+\telkey{TREATMENT OF NEGATIVE DEPTHS} (= 2), contrary to choices for this
+example until 9.0 (NO and 1).
\subsection{Physical parameters}
diff --git a/examples/telemac3d/Viollet/f3d_viollet.slf b/examples/telemac3d/Viollet/f3d_viollet.slf
index 07545973c27b6a3bfd67273a1ef6fe2da4155923..c10f9c5c8cdfa933f99682ed606a05b9075bef55 100644
--- a/examples/telemac3d/Viollet/f3d_viollet.slf
+++ b/examples/telemac3d/Viollet/f3d_viollet.slf
@@ -1,3 +1,3 @@
version https://git-lfs.github.com/spec/v1
-oid sha256:f222b0da0e59ade952b882525d5af8d4e34755d11da55a41a0d194d057ddf5cb
+oid sha256:e210a02958f5f85413e63701d445595fcda11553f0bc8aa07a020e307036436e
size 1778040
diff --git a/examples/telemac3d/Viollet/t3d_viollet.cas b/examples/telemac3d/Viollet/t3d_viollet.cas
index 02f457791ad61fddb1580f84864bdfcfe92c1c6d..44a1bd63d71bc9f6d7b2cd1272cbc774f1f95fe5 100644
--- a/examples/telemac3d/Viollet/t3d_viollet.cas
+++ b/examples/telemac3d/Viollet/t3d_viollet.cas
@@ -39,8 +39,6 @@ PRESCRIBED ELEVATIONS : 0.19995;0.
/LOGARITHMIC PROFILE
VELOCITY VERTICAL PROFILES = 2;2
/
-TIDAL FLATS = NO
-/
VARIABLES FOR 2D GRAPHIC PRINTOUTS = U,V,H,B,S
VARIABLES FOR 3D GRAPHIC PRINTOUTS = Z,U,V,W,RI,NUZ,TA1,NAZ1,EPS,K
MASS-BALANCE = YES
@@ -81,16 +79,18 @@ LAW OF BOTTOM FRICTION = 1 / HAALAND
/----------------------------
/ PROPAGATION
/----------------------------
-/MAXIMUM NUMBER OF ITERATIONS FOR PROPAGATION = 500
-/MAXIMUM NUMBER OF ITERATIONS FOR DIFFUSION OF VELOCITIES = 200
+SOLVER FOR PPE = 1
MAXIMUM NUMBER OF ITERATIONS FOR PPE = 300
ACCURACY FOR DIFFUSION OF VELOCITIES = 1.E-14
ACCURACY FOR DIFFUSION OF K-EPSILON = 1.E-16
ACCURACY FOR DIFFUSION OF TRACERS = 1.E-16
-ACCURACY FOR PROPAGATION = 1.E-10
-ACCURACY FOR PPE = 1.E-10
+ACCURACY FOR PROPAGATION = 1.E-12
+ACCURACY FOR PPE = 1.E-12
+PRECONDITIONING FOR DIFFUSION OF VELOCITIES = 34
+PRECONDITIONING FOR DIFFUSION OF K-EPSILON = 34
+PRECONDITIONING FOR DIFFUSION OF TRACERS = 34
+PRECONDITIONING FOR PPE = 34
/
-IMPLICITATION FOR DEPTH = 1.
/----------------------------
/ SEDIMENT
/----------------------------
@@ -115,9 +115,5 @@ IMPLICITATION FOR DIFFUSION : 2.
/
/ DEFAULT VALUES UNTIL V8P0 KEPT FOR NON REGRESSION
SCHEME OPTION FOR ADVECTION OF VELOCITIES = 1
-IMPLICITATION FOR VELOCITIES = 1.
SCHEME OPTION FOR ADVECTION OF TRACERS = 1
SCHEME OPTION FOR ADVECTION OF K-EPSILON = 1
-/
-/ DEFAULT VALUE UNTIL V8P5 KEPT FOR NON REGRESSION
-TREATMENT OF NEGATIVE DEPTHS = 1
diff --git a/examples/telemac3d/Viollet/vnv_Viollet.py b/examples/telemac3d/Viollet/vnv_Viollet.py
index 9dbf3fbd0c3e886d13a209cf0267ab26df729ed2..99f2f31a05d618e678f89e9b1842c9a95ef7c78c 100644
--- a/examples/telemac3d/Viollet/vnv_Viollet.py
+++ b/examples/telemac3d/Viollet/vnv_Viollet.py
@@ -50,17 +50,17 @@ class VnvStudy(AbstractVnvStudy):
# Comparison with the last time frame of the reference file.
self.check_epsilons('vnv_1:T3DRES',
'f3d_viollet.slf',
- eps=[1.E-7, 1.E-8, 1.E-9, 1.E-8, 1.E-11, 1.E-11, 1.E-11, 2.E-4, 1.E-5, 1.E-11])
+ eps=[1.E-15, 1.E-8, 1.E-12, 1.E-11, 1.E-12, 1.E-12, 1.E-14, 1.E-5, 1.E-15, 1.E-15])
# Comparison with the last time frame of the reference file.
self.check_epsilons('vnv_2:T3DRES',
'f3d_viollet.slf',
- eps=[1.E-7, 1.E-8, 1.E-9, 1.E-8, 1.E-11, 1.E-11, 1.E-11, 3.E-4, 1.E-5, 1.E-11])
+ eps=[1.E-15, 1.E-8, 1.E-12, 1.E-11, 1.E-12, 1.E-12, 1.E-14, 1.E-5, 1.E-15, 1.E-15])
# Comparison between sequential and parallel run.
self.check_epsilons('vnv_1:T3DRES',
'vnv_2:T3DRES',
- eps=[1.E-7, 1.E-8, 1.E-9, 1.E-8, 1.E-11, 1.E-11, 1.E-11, 3.E-4, 1.E-5, 1.E-11])
+ eps=[1.E-15, 1.E-8, 1.E-12, 1.E-11, 1.E-12, 1.E-12, 1.E-14, 1.E-5, 1.E-15, 1.E-15])
def _post(self):