求教使用ANSYS/LS DYNA 做跌落分析时,使用ANSYS自己的计算同使用LS970计算之间的差别
在工作中遇到这样的问题用ANSYS划分网格后,写成K文件,在修改文件的时候老出问题
但是用ANSYS直接求解是没问题的
我想知道 用ANSYS直接求解和使用LS求解之间的差别大不大? 有很大的区别，一个是ANSYS；一个是LS-DYNA的，显示计算，做的是动态碰撞分析，模拟跌落过程较为准确。两者所用的求解器不一样，计算方法也不一样。
好象不对的
有很大的区别，一个是ANSYS；一个是LS-DYNA的，显示计算，做的是动态碰撞分析，模拟跌落过程较为准确。两者所用的求解器不一样，计算方法也不一样。但是ANSYS求解也是调用的LS DYNA的求解截面. 出现的DOS框是970的求解框. 我做的是这样的
ANSYS求解框
ctrl-c interrupts ls-dyna and prompts for a senseswitch.type the desired sense switch: sw1., sw2., etc. to continue
the execution.ls-dyna will respond as explained in the users manual
type response
----- ------------------------------------------------------------
sw1. a restart file is written and ls-dyna terminates.
sw2. ls-dyna responds with time and cycle numbers.
sw3. a restart file is written and ls-dyna continues calculations.
sw4. a plot state is written and ls-dyna continues calculations.
********notice********notice********notice********
* *
* This is the LS-DYNA Explicit Finite Element code. *
* Neither LSTC nor the authors assume any responsibility for *
* the validity, accuracy, or applicability of any results *
* obtained from this system. The user must verify his own *
* results. *
* *
* LSTC endeavors to make the LS-DYNA code as complete, *
* accurate and easy to use as possible. *
* Suggestions and comments are welcomed.Please report any*
* errors encountered in either the documentation or results*
* immediately to LSTC through your site focus. *
* *
* Copyright (C) 1990-2005 *
* by Livermore Software Technology Corp. (LSTC) *
* All rights reserved *
* *
********notice********notice********notice********
input of data is completed
initial kinetic energy = 0.43233228E+04
The LS-DYNA time step size should not exceed 0.358E-08
to avoid contact instabilities.If the step size is
bigger then scale the penalty of the offending surface.
initialization completed
dt of cycle 1 is controlled by solid element 2163
time........................... 0.00000E+00
time step...................... 2.62724E-09
kinetic energy................. 4.32331E+03
internal energy................ 1.00000E-20
spring and damper energy....... 1.00000E-20
hourglass energy .............. 0.00000E+00
system damping energy.......... 0.00000E+00
sliding interface energy....... 0.00000E+00
external work.................. 0.00000E+00
eroded kinetic energy.......... 0.00000E+00
eroded internal energy......... 0.00000E+00
total energy................... 4.32331E+03
total energy / initial energy.. 1.00000E+00
energy ratio w/o eroded energy. 1.00000E+00
global x velocity..............-2.45116E+03
global y velocity.............. 0.00000E+00
global z velocity.............. 0.00000E+00
cpu time per zone cycle............ 8465 nanoseconds
average cpu time per zone cycle.... 8465 nanoseconds
average clock time per zone cycle.. 4892 nanoseconds
estimated total cpu time = 380628 sec ( 105 hrs 43 mins)
estimated cpu time to complete = 380627 sec ( 105 hrs 43 mins)
estimated total clock time = 220002 sec ( 61 hrs6 mins)
estimated clock time to complete= 220002 sec ( 61 hrs6 mins)
顶下
经过这几天的研究发现其实是一样的,ANSYS直接求解也是调用的LS DYNA,但是ANSYS/LS DYNA的接触形式和单元没有LS DYNA里面多,一般的非线性分析,可以直接在ANSYS中去做
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