Hi, All
The fem system is a 3D elastic structure. The element is 3D brick element
Hex8. Mesh refinement is used in this system. The system assembling is
quickly when maximum refinement level is 0 and 1. The system information and
mesh information are as below:
(1) refinement level is 0
EquationSystems
n_systems()=1
System "beam_analysis"
Type "LinearImplicit"
Variables="u" "v" "w"
Finite Element Types="LAGRANGE" "LAGRANGE" "LAGRANGE"
Approximation Orders="FIRST" "FIRST" "FIRST"
n_dofs()=8316
n_local_dofs()=8316
n_constrained_dofs()=0
n_vectors()=2
Mesh Information:
mesh_dimension()=3
spatial_dimension()=3
n_nodes()=2772
n_elem()=1920
n_local_elem()=1920
n_active_elem()=1920
n_subdomains()=1
n_processors()=1
processor_id()=0
(2) refinement level is 1
EquationSystems
n_systems()=1
System "beam_analysis"
Type "LinearImplicit"
Variables="u" "v" "w"
Finite Element Types="LAGRANGE" "LAGRANGE" "LAGRANGE"
Approximation Orders="FIRST" "FIRST" "FIRST"
n_dofs()=37185
n_local_dofs()=37185
n_constrained_dofs()=6708
n_vectors()=2
Mesh Information:
mesh_dimension()=3
spatial_dimension()=3
n_nodes()=12395
n_elem()=10336
n_local_elem()=10336
n_active_elem()=9284
n_subdomains()=1
n_processors()=1
processor_id()=0
But in next iteration the refinement level is 2, The process of system
assembling is very very slowly. It took more than 12 hours when only
assembled 30000 elements. The system and mesh information is :
(3) refinement level is 2
EquationSystems
n_systems()=1
System "beam_analysis"
Type "LinearImplicit"
Variables="u" "v" "w"
Finite Element Types="LAGRANGE" "LAGRANGE" "LAGRANGE"
Approximation Orders="FIRST" "FIRST" "FIRST"
n_dofs()=253785
n_local_dofs()=253785
n_constrained_dofs()=30726
n_vectors()=2
Mesh Information:
mesh_dimension()=3
spatial_dimension()=3
n_nodes()=84595
n_elem()=82048
n_local_elem()=82048
n_active_elem()=72032
n_subdomains()=1
n_processors()=1
processor_id()=0
Is the system too large for only one processor?
--
Yours Sincerely
ShengliXu
Department of Engineering Mechanics
State Key Laboratory of Structural Analysis for Industrial Equipment
Dalian University of Technology
Dalian, 116024, P. R. China
Email: [EMAIL PROTECTED]
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