阿伟版主的教材中，列举了两个时域有限元的算例，两个算例全是加速度边界条件，而有些工况下需要定义的是压力边界条件。类似加速度边界条件的定义方式，我定义了压力边界条件，但计算出错，错误信息如下：SYSNOISE ANALYSIS OPTION :
FEM VARIATIONAL TIME FLUID
SYSNOISE SUMMARY INFORMATION
------------------------------------------------------------------------
Title...Exported VLModel
Date....16-SEP-2015 16:11:25
Number of dimensions...................... 3
Number of nodes........................... 41142
Number of elements........................ 20267
Number of material characteristics........ 1
Number of load cases...................... 1
Number of nodes with pressure B.C.'s...... 1
Number of nodes with an initial condition. 41142
------------------------------------------------------------------------
SYSNOISE> SCL> Option FEM Time Fluid Return
SYSNOISE ANALYSIS OPTION :
FEM VARIATIONAL TIME FLUID
SYSNOISE> SCL> Environment Section SETUP BELL 'on' Return
SYSNOISE> SCL> Environment Section SETUP SOLVITER 0 Return
SYSNOISE> SCL> Environment Section SETUP STABLEFEM TRUE Return
SYSNOISE> SCL> Environment Section SETUP GEO_TOLERANCE '1E-006' Return
SYSNOISE> SCL> Parameter Model 1 Physical
PARAMETER> SCL> Save Potentials Step 1
PARAMETER> SCL> Save Results none
PARAMETER>
PARAMETER> SCL> Newmark 0.25 0.5
PARAMETER> SCL> Return
Updating Model Parameters
SYSNOISE> SCL> Case 1 Return
CURRENT LOAD CASE 1
Load Case # 1 Name: Case 1
SAVING LOAD CASE 1
SYSNOISE> SCL> Solve
SOLVE> SCL> Time 0 To 1 LinStep 0.1
SOLVE> SCL> Return
========================================================================
TIME RESPONSE MODULE
------------------------------------------------------------------------
FOR 11 TIME STEPS FROM 0.000000 TO 1.000000
------------------------------------------------------------------------
SOLVE PARAMETERS
MODEL: 1 - Exported VLModel
------------------------------------------------------------------------
PHYSICAL Coordinates
Saving POTENTIALS every 1 steps
No saving of RESULTS
Energy Calculation Enabled
Surface post-processing on positive side
NEWMARK Time Integration Parameters:
ALPHA = 0.250
DELTA = 0.500
------------------------------------------------------------------------
LAUNCHING UNCOUPLED ACOUSTIC FEM (Physical Coords - Time) ANALYSIS
Computing MASS and STIFFNESS elements matrices
using HIGH PRECISION STABILIZED scheme for linear elements
CPU Stats --- Delta: 0:00:01 ( 1.32) Total: 0:00:01 ( 1.32)
Computing VELOCITY matrices on elements faces
CPU Stats --- Delta: 0:00:00 ( 0.47) Total: 0:00:02 ( 1.79)
NEWMARK TIME INTEGRATION PARAMETERS:
ALPHA = 0.250
DELTA = 0.500
NEWMARK PARAMETERS OK
Reverse Cuthill McKee Ordering :
Old maximum bandwidth: 40737
New maximum bandwidth: 447
Applying nodal fixed pressure values
Occupied space: 28 Mb ( 0.09 %)
Building the matrix of coefficients
Building the damping matrix
ANALYSIS NUMBER 1 / 11 TIME = 0.000000
------------------------------------------------------------------------
CPU Stats --- Delta: 0:00:01 ( 0.71) Total: 0:00:03 ( 2.50)
Generating load vector
SAVING POTENTIALS INTO DATABASE
Initializing skyline matrix
NOT ENOUGH CORE FOR THE STORAGE OF ONE BLOCK OF THE SPARSE MATRIX
Available : -203317434 words (R8 or C*16)
Required : 12183866 words
NOT ENOUGH CORE FOR FACTORIZATION : ADD 48735464 MORE WORDS
CPU Stats --- Delta: 0:00:00 ( 0.04) Total: 0:00:03 ( 2.54)
========================================================================
SYSNOISE> SCL> Close Return
冯博士您好，我现在想在时域有限元的声学网格上添加声压条件，跟结构网格的施加好像有些不同，我是按照阿伟版主的书上加速度边界条件定义方法进行的定义，在计算的时候没有错误，但其实没算，在计算的过程信息中才看到下面的错误：
Initializing skyline matrix
NOT ENOUGH CORE FOR THE STORAGE OF ONE BLOCK OF THE SPARSE MATRIX
Available : -203317434 words (R8 or C*16)
Required : 12183866 words
NOT ENOUGH CORE FOR FACTORIZATION : ADD 48735464 MORE WORDS
问题还是没找到，不知道是参数设置的问题还是定义的条件不对
发表于 2015-9-17 09:11
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发表于 2015-9-18 08:16
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