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Map meshing allows to create brick mesh in any irregular volume or
qudrilateral mesh in any irregular area.
A special mesher needs to be activated before creating mesh by
command
Mshkey,1.
Lesize controls should be given to all lines of areas with the rule
otal number of lesize divisions of opposite sides should be same.
Lccat and accat commands should be used to treat the area as
regular area !area with " lines# or volume as regular volume. ! volume
with $ areas.
%e can create mapped area mesh or mapped volume mesh.
Map mesh is supposed to give best results as we have total controlon element shapes. &ecause of requirement of lesize controls on
each line the process can be very time consuming. &ut if brick
meshing is the requirement then there is no alternative.
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%e will use this area to understand mapped area
mesh.
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fini
'clear'filnam,map(mesh
'prep)
'title,map meshing
rectang,*,1**,*,1**
wpoff,,1**,
pcircle,+*,,+$*asba,1,all
numcmp,all
et,1,shell+
r,1,-
esize,)
amesh,all
c
aclear,all
cstart map meshlesize,1,,,)
lesize,-,,,)
lesize,+,,,+
lesize,",,,)
lesize,/,,,1*
lccat,+,"c
amesh,all
c
aclear,all
c
mshkey,1type,1
amesh,all
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0reate area and do free mesh.
fini
'clear
'filnam,map(mesh
'prep)
'title,map meshingrectang,*,1**,*,1**
wpoff,,1**,
pcircle,+*,,+$*
asba,1,all
numcmp,all
et,1,shell+r,1,-
esize,)
amesh,all
c
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bserve that free meshing can not create all
23A45.
bserve triangular element.
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0clear area and use lesize div
controls cwith rule opposite lines
otal should be csame.
Aclear,all
cstart map mesh
lesize,1,,,)lesize,-,,,)
lesize,+,,,+
lesize,",,,)
lesize,/,,,1*
lccat,+,"
camesh,all
c
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4ecide the lines you want to treat as
opposite.%e will consider lines + and "
opposite to /. Accordingly we will apply
lesize div controls.
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bserve total divisions of opposite
lines are same.
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0onconate the lines + and " to treat them
as single line. 6ow the area has only " lines
and it is treated as regular area.
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bserve the line number$ listed without any line
properties other than total length. his is concotanated
Line.
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Lccat command is used to create concotanated lines. his command is
used the mesher to treat these lines as single line. he lines should be
connected for concotnation.
5ynta78Lccat,l1,l/
nly two lines can be concotanated by e7plicit numbers.
9or more than two lines select the lines and then use lccat,all.
Lesize controls should be given before lccat.
o nullify effect of concotanation delete concotanated line by using
ldele,line no.
:n our case ldele,$ will nullify effect of concotanation.
9or changing lesize controls first concotanated lines should be deleted.
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&ecause of lesize controls it is possible to
create all quad area elements. &ut this is
not mapped mesh.
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bserve the map mesh. 6otice
difference between previous slide and
this slide.
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Mapped ;olume mesh8
5imilar to lccat we have accat,a1,a/
0ommand to concotanate two areas to treat them as single area to
make the volume regular.
:f more than two areas are required to be concotanated then select all
the areas and use accat,all.Lines of concotanated areas are automatically concotanated if only two
areas are concotanated. 3ser should concotanate respective lines of
the concotanated areas if more than two numbers of areas are
concotanated.
&ullean operations can not be done on geometries with concotanatedlines or areas.
4elete concotanated area by adele,area no, to nullify effect of
concotanation.
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As this volume is irregular we can not
create brick mesh. %e will use this
volume to understand map volume mesh.
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0reate the ob
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bserve that as we had provided lesize control to area
before e7truding new corresponding opposite area also
had lesize controls. &ut line numbers 11 to 1- do not have
lesize controls.
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It is necessary that all the lines should have lesize controls and they
should be given before line or area concotanation.
Use lesize controls and then concotanate areas 6 and 7.
lesize,11,,,10
lesize,12,,,10
lesize,13,,,10
lesize,14,,,10
lesize,1,,,10accat,6,7
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Apply lesize controls.
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0oncotanate the areas $ and ) to create regular
volume.
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bserve area number > created on top
of area number $ and ) for meshing
purpose only.
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5ee area number > created as conconated
area.
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bserve line nos 1$ and 1) created as
concotanated lines automatically because of
concotanation of areas.
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bserve concotanated lines 1$ and 1).
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bserve the brick mapped mesh
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!edo the sa"e #roble" by cutting one face by deg.
$nly %ay to bric& "esh is "a##ed "esh for such volu"e.
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'ut the volu"e as sho%n. (elete the unre)uired left
volu"e. 'reate "esh on right volu"e.
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c***cut the volu"e
vclear,all
adele,+
ldele,16,17
local,11,0,,,,,
lgen,2,1,,,,120
a,1,2,12,11
vsba,all,+
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