Can I use this grid for LES?
 

Hi,I want to simulate the pipe flow, and observe the fluctuation of velocity. Like most pipe simulations, I set the pipe diameter = 4cm, the inlet velocity = 0.133m/s, so Re = 5300, y_plus = 0.011cm, and the smallest scales of grid can be 0.055cm. I use GAMBIT, considering the compute capability, let the length of pipe to be 12.5cm. After that, I will use FLUENT LES to simulate

But can you tell me how to use GAMBIT to divide this grid? How to set the size function and boundary layer?

Because I am a new learner of CFD, the follow is my Journal File, Can you tell me whether this grid is suitable for LES? if not ,how to change. Thanks !


/ Journal File for GAMBIT 2.3.16, Database 2.3.14, ntx86 SP2006032921
/ Identifier "default_id8044"
/ File opened for write Mon Sep 15 22:55:01 2014.
volume create height 12.5 radius1 2 radius3 2 offset 0 0 6.25 zaxis frustum
sfunction create "fix1" sourcefaces "face.1" startsize 0.055 growthrate 1.2 \
sizelimit 0.2 attachvolumes "volume.1" fixed
undo begingroup
edge picklink "edge.1"
sfunction bgrid attachedges "edge.1"
edge mesh "edge.1" successive ratio1 1 intervals 130
undo endgroup
undo begingroup
blayer create first 10 growth 1.2 total 74.3008 rows 12 transition 1 trows 0 \
aspectratio
blayer attach "b_layer.1" face "face.1" edge "edge.1" add
undo endgroup
face mesh "face.1" pave size 1
face check "face.1" quality
face msummarize "face.1"
volume mesh "volume.1" cooper source "face.1" "face.3" size 1
undo
/Undone to: volume mesh "volume.1" cooper source "face.1" "face.3" size 1
/ERROR occurred in the next command!
volume mesh "volume.1" cooper source "face.1" size 1
undo
/Undone to: volume mesh "volume.1" cooper source "face.1" size 1
edge delete "edge.1" lowertopology onlymesh
undo
/Undone to: edge delete "edge.1" lowertopology onlymesh
volume mesh "volume.1" cooper source "face.1" "face.3" size 1
volume msummarize "volume.1"
save name "guan.dbs"
/ Journal File for GAMBIT 2.3.16, Database 2.3.14, ntx86 SP2006032921
/ Identifier "guan"
/ File opened for append Mon Sep 15 23:11:35 2014.
identifier name "E:\\fluent\\9.15\\guan.dbs" old nosaveprevious
solver select "FLUENT 5/6"
physics create "wall" btype "WALL" face "face.2"
physics create "inlet" btype "VELOCITY_INLET" face "face.1"
physics create btype "OUTFLOW" face "face.3"
save