定义:自动调整网格重新执行计算
与正常的分析过程不同的是,不需要自己定义网格和求解,其他的几何模型、材料属性以及载荷约束等都正常定义即可。
自适应的网格划分和求解采用ADAPT命令完成。
ADAPT, NSOLN, STARGT,TTARGT, FACMN, FACMX, KYKPS, KYMAC
其中:
NSOLN,求解次数,默认为5次
STARGT,SEPC(structural percent error in energy norm)的目标百分比,默认为5%。
TTARGT:TEPC(thermal percent error in energy norm)的目标百分比,默认为1%。
FACMN,最小单元尺寸变化率,默认为0.25
FACMX,最大单元尺寸变化率,默认为5
KYKPS,考虑单元尺寸是否在选择的点进行修改,0表示不考虑,1表示考虑
KYMAC,考虑用户自定义的宏文件是否使用,0表示不使用,1表示使用。
APADT与关联一个ANSYS预定义的宏文件,关于网格划分和求解的。这个宏文件会在网格重划分后重复执行前处理求解和后处理命令,网格重划分是根据SEPC的值不断变化的。
一个命令流例子:
/PREP7
SMRT,OFF
/TITLE,VM205, ELLIPTIC MEMBRANE UNDER A UNIFORMLY-DISTRIBUTED LOAD
/COM, NAFEMS (REF.58), TEST NO. LE1 (MODIFIED)
/COM, USING 2-D STRUCTURAL SOLID, PLANE182
ANTYPE,STATIC
ET,1,PLANE182,3,,3 ! DEFINE ELEMENT AS PLANE182 FORPLANE STRESS
! WITH THICKNESS
MP,EX,1,210E9 ! DEFINE MATERIAL PROPERTIES
MP,NUXY,1,.3
R,1,0.1 ! SET THICKNESS
LOCAL,11,1,,,,,,,0.5 ! DEFINE ELLIPTICAL COORD. SYSTEM
K,1,2,90 ! CREATE MODEL GEOMETRY
K,2,2,0 ! DEFINE KEYPOINTS
L,1,2 ! DEFINE LINE SEGMENTS
LOCAL,12,1,,,,,,,0.8461585
K,3,3.25,90
K,4,3.25,0.0
L,3,4
CSYS,0
L,2,4
L,1,3
AL,2,4,1,3 ! DEFINE AREA
DL,4,1,SYMM ! APPLY BOUNDARY CONDITIONS
DL,3,1,SYMM
SFL,2,PRES,-10E6 ! APPLY LINE PRESSURE LOAD
MSHK,2 ! MAPPED AREA MESH IFPOSSIBLE
MSHA,0,2D ! USING QUADS
SAVE ! SAVE DATABASE
FINISH
ADAPT,4,7,,,1 ! USE Mechanical APDL PREDEFINEDMACRO FOR ADAPTIVE MESHING
! AND SOLUTION WITH NSOLN=3, STARGT=7, ANDFACMX=1
*CREATE,MAC ! CREATE MACRO FOR POSTPROCESSING
/POST1
EPLOT ! PLOT ELEMENTS
PRERR ! PRINT THE ENERGY NORMPERCENT ERROR (SEPC)
NSEL,S,LOC,Y,0.0
NSEL,R,LOC,X,2.0
*GET,MNODE,NODE,,NUM,MAX
*GET,SY_D,NODE,MNODE,S,Y ! GET DESIRED STRESS SY VALUE
NSEL,ALL
ESEL,ALL
*status,parm ! SHOW STATUS OFPARAMETERS
*END
*USE,MAC ! USE POST PROCESSING MACRO
*DIM,LABEL,CHAR,1,2
*DIM,VALUE,,1,3
LABEL(1,1)= 'TAN STR '
LABEL(1,2)= 'MPa'
*VFILL,VALUE(1,1),DATA,92.70
*VFILL,VALUE(1,2),DATA,(SY_D/1000000)
*VFILL,VALUE(1,3),DATA,ABS((SY_D/1000000)/92.7)
SAVE,TABLE1
FINISH
/CLEAR,NOSTART ! CLEAR DATABASE BEFORE STARTING PART 2
/COM, USING 2-D 8-NODE STRUCTURAL SOLID,PLANE82
/PREP7
SMRT,OFF
RESUME ! RESUME DATABASE
ET,1,PLANE183,,,3 ! DEFINE ELEMENT AS PLANE82 FORPLANE STRESS
! WITH THICKNESS
FINISH
ADAPT,2,5,,,1 ! USE Mechanical APDL PREDEFINEDMACRO FOR ADAPTIVE MESHING