Microtip Field Emitter Example Problem

[jujumoi]

Hello all, Im trying to create an electrostatic example just like this one available at:

http://www.ansys.com/industry/mems/mems_applications/app_micro_tip.htm

I´ve tryied to use SOLID123 and INFINI111 elemnts, and Treffetz domain. The problem is that I applied a voltage (1000V) on the gate surface but I got no results, such as iso surfaces voltage contours plots or particle tracing. I also used Si substrate from MEMs materials library (

http://www.ansys.com/industry/mems/mems_downloads/mems_materials_5_6.zip)

If anyone could help me get this example to work (The microtip specifically or any other electrostaic wich I can get similar results) I would be very thankful. Thanks in advance.

 

[jujumoi]

Well I could get it to work, using axysimetric elements./PREP7
/TITLE, Microtip Field Emitter - Juliano F. Mologni
ET,1,PLANE121,,,1 ! USE 2-D 8-NODE ELECTROSTATIC ELEMENT
V1=60 ! DEFINE STRIP POTENTIAL
V0=0 ! DEFINE GROUND POTENTIAL
MP,PERX,1,1 ! FREE SPACE RELATIVE PERMITTIVITY
MP,PERX,2,11.7 ! SILICON
k,1,0,0,0
k,2,0,3,0
k,3,2,0,0
l,1,2
l,2,3
l,1,3
al,all
k,4,8,0,0
k,5,0,10,0
k,6,8,10,0
l,3,4
l,4,6
l,6,5
l,5,2
rectng,0.8,3.8,4,4.2
l,2,7
l,10,5
l,9,6
l,8,4
LSEL,S,LINE,,11,13
LSEL,A,LINE,,7
al,all
LSEL,ALL
LSEL,S,LINE,,13,14
LSEL,A,LINE,,6
LSEL,A,LINE,,10
al,all
LSEL,ALL
LSEL,S,LINE,,14,15
LSEL,A,LINE,,5
LSEL,A,LINE,,9
al,all
LSEL,ALL
LSEL,S,LINE,,2
LSEL,A,LINE,,4
LSEL,A,LINE,,12
LSEL,A,LINE,,15
LSEL,A,LINE,,8
al,all
LSEL,ALL
ASEL,ALL
aadd,3,4,5,6
NUMCMP,all
AGLUE,ALL
LESIZE,1,,,20
LESIZE,2,,,20
LESIZE,3,,,20
LESIZE,8,,,20
LESIZE,10,,,20
LESIZE,9,,,4
LESIZE,11,,,4
aatt,2
SMRTSIZE,1
AMESH,1
AMESH,2
aatt,1
SMRTSIZE,1
AMESH,3



!Manually apply loadsreprocessors>loads>Define Loads>Apply>Electric>Boundary>Voltage>On Areas
!Apply V0 on area 1 and V1 on Area 2



FINISH
/SOLUTION
SOLVE
FINISH
/POST1
ETABLE,SENE,SENE
ETABLE,EFX,EF,X
ETABLE,EFY,EF,Y
/NUMBER,1
PLNSOL,VOLT

The expansion command worked very good, just like particle tracing, but the only problem Im still having is to apply an inifinity boundary ellement. I can only apply INFI110 on the top and the sides, otherwise it comes an error saying it´s not possible to mesh due to it´s irregularity. Any one have a sugestion on how to apply a single layer infin110 elemnt? Thanks in advance

 

[jujumoi]

Nevermind, I just made it