Reply To: MEMS and Lorentz forces

[J G]

 

HI Bill,

I am new to Ansys and was trying to replicate the simulation above.

The simulation setup is almost identical to what you have done above.

I assigned both the bodies with same material (structural steel, the Command object should overwrite the properties for the air) and had one Physics region assigned for all the bodies.

Apart from that, everything else is identical to your setup above, but I kept getting the errror below (i have copied the whole solution information at the end).

 *** ERROR ***                           CP =       2.531   TIME= 22:06:58
 For element type = 2 (SOLID226), KEYOPT(4) = 4 is invalid.

 

 

Which I feel shouln’t be case as I can see the option in valid in the table from the element reference document.

Is there something else I am missing?

 

 Verification–Coupled Field Static (A5)                                      



          ***** MAPDL ANALYSIS DEFINITION (PREP7) *****
 *********** Nodes for the whole assembly ***********
 *********** Elements for Body 1 “beam” ***********
 *********** Elements for Body 2 “air” ***********
 *********** Send User Defined Coordinate System(s) ***********
 *********** Set Reference Temperature ***********
 *********** Send Materials ***********

 PRINTOUT RESUMED BY /GOP

 C*** Beam attributes


 *GET  DMNSN     FROM  PARM  typeids   ITEM=DIM  1     VALUE=  1.00000000   

 *IF  dmnsn                             ( =   1.00000     )  EQ 
      1                                 ( =   1.00000     )  THEN   

 ELEMENT TYPE       1 IS SOLID226     3-D 20-NODE STRUC-EMAG SOLID
  KEYOPT( 1- 6)=    10101      0      0        0      0      0
  KEYOPT( 7-12)=        0      0      0        0      0      0
  KEYOPT(13-18)=        0      0      0        0      0      0

 CURRENT NODAL DOF SET IS  UX    UY    UZ    AZ    TEMP  VOLT
  THREE-DIMENSIONAL MODEL

 ELEMENT TYPE       1 IS SOLID226     3-D 20-NODE STRUC-EMAG SOLID
  KEYOPT( 1- 6)=    10101      0      0        0      0      0
  KEYOPT( 7-12)=        0      1      0        0      0      0
  KEYOPT(13-18)=        0      0      0        0      0      0

 CURRENT NODAL DOF SET IS  UX    UY    UZ    AZ    TEMP  VOLT
  THREE-DIMENSIONAL MODEL

 *ELSEIF  dmnsn                             ( =   1.00000     )  EQ 
          2                                 ( =   2.00000     )  THEN   

 *ENDIF

 MATERIAL          1     MURX =   1.000000     

 ARRAY PARAMETER MATIDS    DELETED.

 ARRAY PARAMETER TYPEIDS   DELETED.

 SET PARAMETER DIMENSIONS ON  MATIDS TYPE=ARRA  DIMENSIONS=     1     1     1

 PARAMETER MATIDS(1) =     2.000000000   

 PARAMETER MATID =     2.000000000   

 SET PARAMETER DIMENSIONS ON  TYPEIDS TYPE=ARRA  DIMENSIONS=     1     1     1

 PARAMETER TYPEIDS(1) =     2.000000000   

 PARAMETER ARG1 =     1.000000000   

 PRINTOUT RESUMED BY /GOP

 C*** Air attributes


 *GET  DMNSN     FROM  PARM  typeids   ITEM=DIM  1     VALUE=  1.00000000   

 *IF  dmnsn                             ( =   1.00000     )  EQ 
      1                                 ( =   1.00000     )  THEN   

 ELEMENT TYPE       2 IS SOLID226     3-D 20-NODE COUPL-FLD SOLID
  KEYOPT( 1- 6)=      111      0      0        0      0      0
  KEYOPT( 7-12)=        0      0      0        0      0      0
  KEYOPT(13-18)=        0      0      0        0      0      0

 CURRENT NODAL DOF SET IS  UX    UY    UZ    AZ    TEMP  VOLT
  THREE-DIMENSIONAL MODEL

 *** ERROR ***                           CP =       2.531   TIME= 22:06:58
 For element type = 2 (SOLID226), KEYOPT(4) = 4 is invalid.             

 CURRENT NODAL DOF SET IS  UX    UY    UZ    AZ    TEMP  VOLT
  THREE-DIMENSIONAL MODEL


 NUMBER OF WARNING MESSAGES ENCOUNTERED=          0
 NUMBER OF ERROR   MESSAGES ENCOUNTERED=          1



 ***** PROBLEM TERMINATED BY INDICATED ERROR(S) OR BY END OF INPUT DATA *****

Regards,

Jack