ANSYS热分析时,同一模型,选用两个不同的时间步长,结果差别怎么很大?两次的命令如下,第一次选1d为步长:*DO,DAY,1,15,1ALLSEL,ALLCMSEL,S,G1_VOLUESLV,SNSLE,S,1HE00=80460*(EXP(-0.79*(DAY-1)**0.70)-EXP(-0.79*DAY**0.70))
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![ANSYS热分析时,同一模型,选用两个不同的时间步长,结果差别怎么很大?两次的命令如下,第一次选1d为步长:*DO,DAY,1,15,1ALLSEL,ALLCMSEL,S,G1_VOLUESLV,SNSLE,S,1HE00=80460*(EXP(-0.79*(DAY-1)**0.70)-EXP(-0.79*DAY**0.70))](/uploads/image/z/6357502-46-2.jpg?t=ANSYS%E7%83%AD%E5%88%86%E6%9E%90%E6%97%B6%2C%E5%90%8C%E4%B8%80%E6%A8%A1%E5%9E%8B%2C%E9%80%89%E7%94%A8%E4%B8%A4%E4%B8%AA%E4%B8%8D%E5%90%8C%E7%9A%84%E6%97%B6%E9%97%B4%E6%AD%A5%E9%95%BF%2C%E7%BB%93%E6%9E%9C%E5%B7%AE%E5%88%AB%E6%80%8E%E4%B9%88%E5%BE%88%E5%A4%A7%3F%E4%B8%A4%E6%AC%A1%E7%9A%84%E5%91%BD%E4%BB%A4%E5%A6%82%E4%B8%8B%2C%E7%AC%AC%E4%B8%80%E6%AC%A1%E9%80%891d%E4%B8%BA%E6%AD%A5%E9%95%BF%EF%BC%9A%2ADO%2CDAY%2C1%2C15%2C1ALLSEL%2CALLCMSEL%2CS%2CG1_VOLUESLV%2CSNSLE%2CS%2C1HE00%3D80460%2A%28EXP%28-0.79%2A%28DAY-1%29%2A%2A0.70%29-EXP%28-0.79%2ADAY%2A%2A0.70%29%29)
ANSYS热分析时,同一模型,选用两个不同的时间步长,结果差别怎么很大?两次的命令如下,第一次选1d为步长:*DO,DAY,1,15,1ALLSEL,ALLCMSEL,S,G1_VOLUESLV,SNSLE,S,1HE00=80460*(EXP(-0.79*(DAY-1)**0.70)-EXP(-0.79*DAY**0.70))
ANSYS热分析时,同一模型,选用两个不同的时间步长,结果差别怎么很大?两次的命令如下,
第一次选1d为步长:
*DO,DAY,1,15,1
ALLSEL,ALL
CMSEL,S,G1_VOLU
ESLV,S
NSLE,S,1
HE00=80460*(EXP(-0.79*(DAY-1)**0.70)-EXP(-0.79*DAY**0.70))
BFE,ALL,HGEN,,HE00
ALLSEL
TRNOPT,FULL
LUMPM,0
TIME,DAY
AUTOTS,0
DELTIM,1,,,1
KBC,0
TSRES,ERASE
OUTRES,ALL,ALL,
SOLVE
*ENDDO
第二次选0.25d为步长:
*DO,DAY,0.25,5,0.25
ALLSEL,ALL
CMSEL,S,G1_VOLU
ESLV,S
NSLE,S,1
HE00=80460*(EXP(-0.79*(DAY-0.25)**0.70)-EXP(-0.79*DAY**0.70))
BFE,ALL,HGEN,,HE00
ALLSEL
TRNOPT,FULL
LUMPM,0
TIME,DAY
AUTOTS,0
DELTIM,1,,,1
KBC,0
TSRES,ERASE
OUTRES,ALL,ALL,
SOLVE
*ENDDO
ANSYS热分析时,同一模型,选用两个不同的时间步长,结果差别怎么很大?两次的命令如下,第一次选1d为步长:*DO,DAY,1,15,1ALLSEL,ALLCMSEL,S,G1_VOLUESLV,SNSLE,S,1HE00=80460*(EXP(-0.79*(DAY-1)**0.70)-EXP(-0.79*DAY**0.70))
时间步长的设置主要影响的是求解精度以及求解所耗时间,如果对精度要求不是很严格,步长可以不必太计较.