Note
Go to the end to download the full example code.
Basic Thermal Analysis with PyMAPDL#
This example demonstrates how you can use MAPDL to create a plate, impose thermal boundary conditions, solve, and plot it all within PyMAPDL.
First, start MAPDL as a service and disable all but error messages.
from ansys.mapdl.core import launch_mapdl
mapdl = launch_mapdl()
Geometry and Material Properties#
Create a simple beam, specify the material properties, and mesh it.
mapdl.prep7()
mapdl.mp("kxx", 1, 45)
mapdl.et(1, 90)
mapdl.block(-0.3, 0.3, -0.46, 1.34, -0.2, -0.2 + 0.02)
mapdl.vsweep(1)
mapdl.eplot()
Boundary Conditions#
Set the thermal boundary conditions
mapdl.asel("S", vmin=3)
mapdl.nsla()
mapdl.d("all", "temp", 5)
mapdl.asel("S", vmin=4)
mapdl.nsla()
mapdl.d("all", "temp", 100)
out = mapdl.allsel()
Solve#
Solve the thermal static analysis and print the results
mapdl.vsweep(1)
mapdl.run("/SOLU")
print(mapdl.solve())
out = mapdl.finish()
*** NOTE *** CP = 161.522 TIME= 10:03:31
The automatic domain decomposition logic has selected the MESH domain
decomposition method with 2 processes per solution.
***** MAPDL SOLVE COMMAND *****
*** NOTE *** CP = 161.533 TIME= 10:03:31
There is no title defined for this analysis.
*** MAPDL - ENGINEERING ANALYSIS SYSTEM RELEASE 24.2 ***
Ansys Mechanical Enterprise Academic Student
01055371 VERSION=LINUX x64 10:03:31 OCT 04, 2024 CP= 161.540
S O L U T I O N O P T I O N S
PROBLEM DIMENSIONALITY. . . . . . . . . . . . .3-D
DEGREES OF FREEDOM. . . . . . TEMP
ANALYSIS TYPE . . . . . . . . . . . . . . . . .STATIC (STEADY-STATE)
GLOBALLY ASSEMBLED MATRIX . . . . . . . . . . .SYMMETRIC
*** NOTE *** CP = 161.541 TIME= 10:03:31
Present time 0 is less than or equal to the previous time. Time will
default to 1.
*** NOTE *** CP = 161.542 TIME= 10:03:31
The conditions for direct assembly have been met. No .emat or .erot
files will be produced.
D I S T R I B U T E D D O M A I N D E C O M P O S E R
...Number of elements: 450
...Number of nodes: 2720
...Decompose to 2 CPU domains
...Element load balance ratio = 1.004
L O A D S T E P O P T I O N S
LOAD STEP NUMBER. . . . . . . . . . . . . . . . 1
TIME AT END OF THE LOAD STEP. . . . . . . . . . 1.0000
NUMBER OF SUBSTEPS. . . . . . . . . . . . . . . 1
STEP CHANGE BOUNDARY CONDITIONS . . . . . . . . NO
PRINT OUTPUT CONTROLS . . . . . . . . . . . . .NO PRINTOUT
DATABASE OUTPUT CONTROLS. . . . . . . . . . . .ALL DATA WRITTEN
FOR THE LAST SUBSTEP
SOLUTION MONITORING INFO IS WRITTEN TO FILE= file.mntr
Range of element maximum matrix coefficients in global coordinates
Maximum = 13.6474747 at element 450.
Minimum = 13.6474747 at element 105.
*** ELEMENT MATRIX FORMULATION TIMES
TYPE NUMBER ENAME TOTAL CP AVE CP
1 450 SOLID90 0.019 0.000042
Time at end of element matrix formulation CP = 161.604019.
DISTRIBUTED SPARSE MATRIX DIRECT SOLVER.
Number of equations = 2606, Maximum wavefront = 72
Memory allocated on only this MPI rank (rank 0)
-------------------------------------------------------------------
Equation solver memory allocated = 3.183 MB
Equation solver memory required for in-core mode = 3.061 MB
Equation solver memory required for out-of-core mode = 1.995 MB
Total (solver and non-solver) memory allocated = 819.543 MB
Total memory summed across all MPI ranks on this machines
-------------------------------------------------------------------
Equation solver memory allocated = 5.932 MB
Equation solver memory required for in-core mode = 5.705 MB
Equation solver memory required for out-of-core mode = 3.755 MB
Total (solver and non-solver) memory allocated = 1257.393 MB
*** NOTE *** CP = 161.635 TIME= 10:03:31
The Distributed Sparse Matrix Solver is currently running in the
in-core memory mode. This memory mode uses the most amount of memory
in order to avoid using the hard drive as much as possible, which most
often results in the fastest solution time. This mode is recommended
if enough physical memory is present to accommodate all of the solver
data.
Distributed sparse solver maximum pivot= 32.7757037 at node 2026 TEMP.
Distributed sparse solver minimum pivot= 0.721118913 at node 1543 TEMP.
Distributed sparse solver minimum pivot in absolute value= 0.721118913
at node 1543 TEMP.
*** ELEMENT RESULT CALCULATION TIMES
TYPE NUMBER ENAME TOTAL CP AVE CP
1 450 SOLID90 0.014 0.000032
*** NODAL LOAD CALCULATION TIMES
TYPE NUMBER ENAME TOTAL CP AVE CP
1 450 SOLID90 0.010 0.000022
*** LOAD STEP 1 SUBSTEP 1 COMPLETED. CUM ITER = 1
*** TIME = 1.00000 TIME INC = 1.00000 NEW TRIANG MATRIX
*** MAPDL BINARY FILE STATISTICS
BUFFER SIZE USED= 16384
0.625 MB WRITTEN ON ASSEMBLED MATRIX FILE: file0.full
0.562 MB WRITTEN ON RESULTS FILE: file0.rth
Post-Processing using MAPDL#
View the thermal solution of the beam by getting the results directly through MAPDL.
mapdl.post1()
mapdl.set(1, 1)
mapdl.post_processing.plot_nodal_temperature()
Alternatively you could also use the result object that reads in the result file using pyansys
[ 1 2 3 ... 11612 11613 11614] [ 0. 0. 0. ... nan nan nan]
Stop mapdl#
mapdl.exit()
/opt/hostedtoolcache/Python/3.11.10/x64/lib/python3.11/site-packages/ansys/mapdl/core/launcher.py:818: UserWarning: The environment variable 'PYMAPDL_START_INSTANCE' is set, hence the argument 'start_instance' is overwritten.
warnings.warn(
Total running time of the script: (0 minutes 8.617 seconds)