## General Mechanical

#### ***ERROR*** Resistivity must be input for velocity effect in elements

• dhruvdeshwal17
Subscriber

Greetings

This is an error I am facing while doing analysis.

The analysis - A copper plate and a magnet are placed adjacent to each other with a certain gap. A velocity is given to the plate (-0.1m/s) and the magnet remains stationary. So, as the plate move, the plate will see a change in a magnetic field by which eddy current will be generated in the plate and due to this current a magnetic field will be generated of opposite polarity as that of the magnet. Due to this generated magnetic field, the magnet experiences a force. I FMAGBC the copper plate and parallel flux as a boundary condition.

My aim is to calculate the eddy current, Lorentz force associated with this analysis, but I am not able to solve it.

I am providing Marcos of my problem for a better understanding of the analysis.

/PREP7

!*

ET,1,SOLID97

!*

KEYOPT,1,1,1

KEYOPT,1,2,1

KEYOPT,1,5,1

!*

KEYOPT,1,1,1

!*

!Real Constants

R,1,

RMORE, , , , ,-0.1, ,

RMORE, , , , , ,

!*

!*

R,2,

RMORE, , , , , , ,

RMORE, , , , , ,

!*

!*

! Material Properties

MPTEMP,,,,,,,,

MPTEMP,1,0

MPDATA,MURX,1,,1.2289  ! Permeability of magnet

MPTEMP,,,,,,,,

MPTEMP,1,0

MPDATA,MGXX,1,,

MPDATA,MGYY,1,,

MPDATA,MGZZ,1,,9.26e5  !coercive force of magnet

MPTEMP,,,,,,,,

MPTEMP,1,0

MPDATA,MURX,2,,0.999  ! Permeability of copper plate

MPTEMP,,,,,,,,

MPTEMP,1,0

MPDATA,RSVX,2,,1.72e-8 ! Resistivity of copper plate

MPTEMP,,,,,,,,

MPTEMP,1,0

MPDATA,MURX,3,,1  ! Permeability of air

! Modelling

BLOCK,-0.013,0.013,-0.013,0.013,-0.0025,0.0025, ! copper plate

CYLIND,0.013, ,0.0055,0.0355,0,360,  ! magnet

BLOCK,-0.05,0.05,-0.05,0.05,-0.05,0.05, ! enclosed area

FLST,2,3,6,ORDE,2

FITEM,2,1

FITEM,2,-3

VOVLAP,P51X

FLST,2,3,6,ORDE,3

FITEM,2,1

FITEM,2,-2

FITEM,2,4

VGLUE,P51X

/VIEW,1,1,1,1

/ANG,1

/REP,FAST

NUMCMP,VOLU

! Meshing

TYPE,  1

MAT,    1

REAL,    2

ESYS,    0

SECNUM,

!*

MSHAPE,1,3D

MSHKEY,0

!*

CM,_Y,VOLU

VSEL, , , ,    2

CM,_Y1,VOLU

CHKMSH,'VOLU'

CMSEL,S,_Y

!*

VMESH,_Y1

!*

CMDELE,_Y

CMDELE,_Y1

CMDELE,_Y2

!*

TYPE,  1

MAT,    2

REAL,    1

ESYS,    0

SECNUM,

!*

CM,_Y,VOLU

VSEL, , , ,    1

CM,_Y1,VOLU

CHKMSH,'VOLU'

CMSEL,S,_Y

!*

VMESH,_Y1

!*

CMDELE,_Y

CMDELE,_Y1

CMDELE,_Y2

!*

TYPE,  1

MAT,    3

REAL,    2

ESYS,    0

SECNUM,

!*

CM,_Y,VOLU

VSEL, , , ,    3

CM,_Y1,VOLU

CHKMSH,'VOLU'

CMSEL,S,_Y

!*

VMESH,_Y1

!*

CMDELE,_Y

CMDELE,_Y1

CMDELE,_Y2

!*

ALLSEL,ALL

! Force Flag

VSEL,S, , ,    1

ESLV,S

CM,A,ELEM

ALLSEL,ALL

!*

!*

FMAGBC,'A'

! Boundary Condition

FLST,2,6,5,ORDE,2

FITEM,2,11

FITEM,2,-16

DA,P51X,ASYM

FINISH

/SOL

! Tranisent Velocity

!*

ANTYPE,4

!*

TRNOPT,FULL

!*

DELTIM,0.002,0,0

OUTRES,ERASE

OUTRES,ALL,ALL

AUTOTS,1

TIME,0.01

/STATUS,SOLU

SOLVE

Thank You!

• Navya C
Ansys Employee
nWhich Ansys tool are you using for this simulation?.RegardsnNavya?n
• dhruvdeshwal17
Subscriber