concept of mapped mesh11

7/24/2019 Concept of Mapped Mesh11

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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.


2/28

%e will use this area to understand mapped area

mesh.


3/28

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


4/28

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


5/28

bserve that free meshing can not create all

23A45.

bserve triangular element.


6/28

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


7/28

4ecide the lines you want to treat as

opposite.%e will consider lines + and "

opposite to /. Accordingly we will apply

lesize div controls.


8/28

bserve total divisions of opposite

lines are same.


9/28

0onconate the lines + and " to treat them

as single line. 6ow the area has only " lines

and it is treated as regular area.


10/28

bserve the line number$ listed without any line

properties other than total length. his is concotanated

Line.


11/28

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.


12/28

&ecause of lesize controls it is possible to

create all quad area elements. &ut this is

not mapped mesh.


13/28

bserve the map mesh. 6otice

difference between previous slide and

this slide.


14/28

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.


15/28

As this volume is irregular we can not

create brick mesh. %e will use this

volume to understand map volume mesh.


16/28

0reate the ob


17/28

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.


18/28

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


19/28

Apply lesize controls.


20/28

0oncotanate the areas $ and ) to create regular

volume.


21/28

bserve area number > created on top

of area number $ and ) for meshing

purpose only.


22/28

5ee area number > created as conconated

area.


23/28

bserve line nos 1$ and 1) created as

concotanated lines automatically because of

concotanation of areas.


24/28

bserve concotanated lines 1$ and 1).


25/28

bserve the brick mapped mesh


26/28

!edo the sa"e #roble" by cutting one face by deg.

$nly %ay to bric& "esh is "a##ed "esh for such volu"e.


27/28

'ut the volu"e as sho%n. (elete the unre)uired left

volu"e. 'reate "esh on right volu"e.


28/28

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,+

concept of mapped mesh11

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