March 20, 2023 at 12:15 amYonghwa YiSubscriberI want to rotate a sphere using ansys apdl, but the following warnings and errors occur.
How can I correct warnings and errors?* I also uploaded my ansys apdl code.*** WARNING *** CP = 6.000 TIME= 19:12:22The program chosen initial timestep/load-factor is arbitrary. It isnecessary for the user to supply a suitable initialtimestep/load-factor through the NSUB or DELTIM command forconvergence and overall efficiency.*** ERROR *** CP = 7.156 TIME= 19:12:24There is at least 1 small equation solver pivot term (e.g., at the UXdegree of freedom of node 1140). Please check for an insufficientlyconstrained model.
code :/GO/COM,/COM,Preferences for GUI filtering have been set to display:/COM, Structural/CLEAR/FILN,SPHERE_32_reduced/PREP7!------------ SET PARAMETERS -------------*SET,ANG_VELO,20106*SET,TEMPER,2573*SET,RHO,8562*SET,I,1ET,1,SOLID186!------------ MATERIAL PROPERTIES ---------MPTEMP,,,,,,,,MPTEMP,1,0MPDATA,EX,1,,1.03E11MPDATA,PRXY,1,,0.38TB,CREE,1,1,3,10TBTEMP,0TBDATA,,0.264E-9,2.476,55326,,,MPTEMP,,,,,,,,MPTEMP,1,0MPDATA,DENS,1,,RHO!------------ CREATE SPHERE ---------SPH4,0,0,0.0011638VSBW,ALLLOCAL,11,0,0,0,0, ,-90, ,1,1,WPCSYS,-1,11,VSBW,ALLLOCAL,11,0,0,0,0, , ,90,1,1,WPCSYS,-1,11,VSBW,ALLCSDELE,11, ,1,WPCSYS,-1,0VGLUE,ALL!----------- CREATE MESH --------------ESIZE,0.0002097TYPE, 1MAT, 1REAL,ESYS, 0SECNUM,MSHAPE,1,3DMSHKEY,0!*FLST,5,8,6,ORDE,7FITEM,5,1FITEM,5,-2FITEM,5,4FITEM,5,-6FITEM,5,8FITEM,5,13FITEM,5,-14CM,_Y,VOLUVSEL, , , ,P51XCM,_Y1,VOLUCHKMSH,'VOLU'CMSEL,S,_Y!*VMESH,_Y1!*CMDELE,_YCMDELE,_Y1CMDELE,_Y2!------------- APPLY BOUNDARY CONDITIONS ---------TUNIF,TEMPERNSEL,S,LOC,Z,0D,ALL,UZ,0NSEL,ALLNSEL,S,LOC,X,0NSEL,R,LOC,Y,0D,ALL,UX,0D,ALL,UY,0ALLSEL,ALL!------------- INITIAL CONDITION FOR TRANSIENT ANALYSIS ---------/SOLUANTYPE,TRANSTIMINT,OFFSOLCONTROL,1AUTOTS,1RESCONTRL,DEFINE,ALL,1,1LNSRCH,0CNVTOL,F, ,0.00005,2,0.01,RATE,1TIME,1SOLVEFINISH
March 21, 2023 at 7:56 ammjmiddleAnsys Employee
Volume elements, such as solid186, only have translational degrees of freedom (DOF), no rotations. However, the model still needs to be constrained from rotating. This is done by having some constraint in XYZ directions for at least 3 non-colinear nodes. The UZ=0 on the plane of nodes at Z=0 will prevent RX, RY rotation. However, you then restrict the node selection to all nodes along the Z axis and set, UX=0, UY=0. This still allows RZ rotation. If you set UX=0 or UY=0 on just one node not along the Z axis, you will then have a fully constrained model.
March 31, 2023 at 6:24 pmYonghwa YiSubscriber
thanks for your help
What additional commands should I put in?
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