SteffB
Mechanical
- Mar 6, 2023
- 3
Dear forum users,
I have a small problem with an undesired changing time step in a single frame restart calculation.
The time step suddenly jumps from 0.1 s to 1s (the default value) in the middle of the simulation.
After 11 load steps, the time increment jumps to 1 s.
Although I have set the time with Time, dt..... I have defined a time step of 0.1 s.
I have already tried to suppress the behaviour of the solver with "autots,off" at various points in the APDL snippet script, unfortunately without success.
I use single frame restart, therefore the restart database should be the first load step
but the solver output indicates something is wrong. In the 12th step something is changing the time step from 0,1s to 1s
*** ANSYS GLOBAL STATUS ***
TITLE = ConvRadSURF152Test–Thermisch-transient (E5)
ANALYSIS TYPE = TRANSIENT
NUMBER OF ELEMENT TYPES = 5
17120 ELEMENTS CURRENTLY SELECTED. MAX ELEMENT NUMBER = 21920
58666 NODES CURRENTLY SELECTED. MAX NODE NUMBER = 58666
17 COMPONENTS CURRENTLY DEFINED
MAXIMUM LINEAR PROPERTY NUMBER = 2
MAXIMUM REAL CONSTANT SET NUMBER = 4
ACTIVE COORDINATE SYSTEM = 0 (CARTESIAN)
NUMBER OF SPECIFIED CONSTRAINTS = 31087
NUMBER OF SPECIFIED SURFACE LOADS = 3520
CURRENT LOAD CASE = 0 OF 0
LOAD SET = 1
SUBSTEP = 1
[highlight #CC0000] TIME/FREQ = 0.10000[/highlight]
INITIAL JOBNAME = file
CURRENT JOBNAME = file
RESTART PROCEDURE RE-BUILDS BOUNDARY CONDITIONS
AND LOADING INFO UPTO THE CURRENT LOADSTEP
READ ANSYS LOADS DATA FROM FILE= file.ldhi
DELETE SOLID MODEL BOUNDARY CONDITIONS
….
SOLUTION MONITORING INFO IS WRITTEN TO FILE= file.mntr
*** LOAD STEP 11 SUBSTEP 1 COMPLETED. CUM ITER = 11
*** TIME = 1.10000 [highlight #CC0000] TIME INC = 0.100000[/highlight] NEW TRIANG MATRIX
*** RESPONSE EIGENVALUE = 796.3 OSCILLATION LIMIT = 79.63
FINISH SOLUTION PROCESSING
***** ROUTINE COMPLETED ***** CP = 34.109
*** ANSYS GLOBAL STATUS ***
TITLE = ConvRadSURF152Test–Thermisch-transient (E5)
ANALYSIS TYPE = TRANSIENT
NUMBER OF ELEMENT TYPES = 5
17120 ELEMENTS CURRENTLY SELECTED. MAX ELEMENT NUMBER = 21920
58666 NODES CURRENTLY SELECTED. MAX NODE NUMBER = 58666
17 COMPONENTS CURRENTLY DEFINED
MAXIMUM LINEAR PROPERTY NUMBER = 2
MAXIMUM REAL CONSTANT SET NUMBER = 4
ACTIVE COORDINATE SYSTEM = 0 (CARTESIAN)
NUMBER OF SPECIFIED CONSTRAINTS = 31087
NUMBER OF SPECIFIED SURFACE LOADS = 3520
CURRENT LOAD CASE = 0 OF 0
LOAD SET = 1
SUBSTEP = 1
[highlight #CC0000] TIME/FREQ = 0.10000[/highlight]
INITIAL JOBNAME = file
CURRENT JOBNAME = file
RESTART PROCEDURE RE-BUILDS BOUNDARY CONDITIONS
AND LOADING INFO UPTO THE CURRENT LOADSTEP
READ ANSYS LOADS DATA FROM FILE= file.ldhi
DELETE SOLID MODEL BOUNDARY CONDITIONS
NUMBER OF NODAL CONSTRAINTS DELETED = 31087
NUMBER OF ELEMENT CONVECTIONS/HEAT FLUXES DELETED = 1760
*** NOTE *** CP = 34.953 TIME= 06:49:36
The number of results set on the restart command is the last set on the
RTH file. No updating for the RTH file is required.
STEP BOUNDARY CONDITION KEY= 1
REFERENCE TEMPERATURE= 0.000 (TUNIF= 25.000)
INERTIA RELIEF KEY= 0
UNIFORM TEMPERATURE SET TO 25.0000000
ACEL= 0.0000 0.0000 0.0000
OMEGA= 0.0000 0.0000 0.0000
DOMEGA= 0.0000 0.0000 0.0000
CGLOC= 0.0000 0.0000 0.0000
CGOMGA= 0.0000 0.0000 0.0000
DCGOMG= 0.0000 0.0000 0.0000
SPECIFIED CONSTRAINT TEMP FOR SELECTED NODES 1 TO 1 BY 1
REAL= 30.0000000 IMAG= 0.00000000
SPECIFIED CONSTRAINT TEMP FOR SELECTED NODES 2 TO 2 BY 1
REAL= 30.0000000 IMAG= 0.00000000
…
SPECIFIED CONSTRAINT TEMP FOR SELECTED NODES 47685 TO 47685 BY 1
REAL= 70.0000000 IMAG= 0.00000000
SPECIFIED CONSTRAINT TEMP FOR SELECTED NODES 47686 TO 47686 BY 1
REAL= 70.0000000 IMAG= 0.00000000
NONE SELECT FOR ITEM=NODE COMPONENT=
IN RANGE 1 TO 58666 STEP 1
0 NODES (OF 58666 DEFINED) SELECTED BY NSEL COMMAND.
NONE SELECT FOR ITEM=ELEM COMPONENT=
IN RANGE 1 TO 21920 STEP 1
0 ELEMENTS (OF 17120 DEFINED) SELECTED BY ESEL COMMAND.
*** WARNING *** CP = 36.891 TIME= 06:49:38
Entity 100 is undefined. The ESEL command is ignored.
*** ANSYS – ENGINEERING ANALYSIS SYSTEM RELEASE 2021 R2 21.2 ***
Ansys Mechanical Enterprise Academic Teaching
00000000 VERSION=WINDOWS x64 06:49:39 MAR 25, 2023 CP= 37.094
ConvRadSURF152Test–Thermisch-transient (E5)
*** WARNING *** CP = 37.109 TIME= 06:49:39
Material number 5 (used by element 20161) should normally have at least
one MP or one TB type command associated with it. Output of energy by
material may not be available.
*** ANSYS – ENGINEERING ANALYSIS SYSTEM RELEASE 2021 R2 21.2 ***
Ansys Mechanical Enterprise Academic Teaching
00000000 VERSION=WINDOWS x64 06:49:39 MAR 25, 2023 CP= 37.375
ConvRadSURF152Test–Thermisch-transient (E5)
SOLUTION MONITORING INFO IS WRITTEN TO FILE= file.mntr
*** LOAD STEP 12 SUBSTEP 1 COMPLETED. CUM ITER = 12
*** TIME = 2.10000 [highlight #CC0000] TIME INC = 1.00000[/highlight] NEW TRIANG MATRIX
*** RESPONSE EIGENVALUE = 1298. OSCILLATION LIMIT = 1298.
FINISH SOLUTION PROCESSING
***** ROUTINE COMPLETED ***** CP = 39.297
I don't know why this is happening
With best regards
Steff
I have a small problem with an undesired changing time step in a single frame restart calculation.
The time step suddenly jumps from 0.1 s to 1s (the default value) in the middle of the simulation.
After 11 load steps, the time increment jumps to 1 s.
Although I have set the time with Time, dt..... I have defined a time step of 0.1 s.
I have already tried to suppress the behaviour of the solver with "autots,off" at various points in the APDL snippet script, unfortunately without success.
I use single frame restart, therefore the restart database should be the first load step
but the solver output indicates something is wrong. In the 12th step something is changing the time step from 0,1s to 1s
*** ANSYS GLOBAL STATUS ***
TITLE = ConvRadSURF152Test–Thermisch-transient (E5)
ANALYSIS TYPE = TRANSIENT
NUMBER OF ELEMENT TYPES = 5
17120 ELEMENTS CURRENTLY SELECTED. MAX ELEMENT NUMBER = 21920
58666 NODES CURRENTLY SELECTED. MAX NODE NUMBER = 58666
17 COMPONENTS CURRENTLY DEFINED
MAXIMUM LINEAR PROPERTY NUMBER = 2
MAXIMUM REAL CONSTANT SET NUMBER = 4
ACTIVE COORDINATE SYSTEM = 0 (CARTESIAN)
NUMBER OF SPECIFIED CONSTRAINTS = 31087
NUMBER OF SPECIFIED SURFACE LOADS = 3520
CURRENT LOAD CASE = 0 OF 0
LOAD SET = 1
SUBSTEP = 1
[highlight #CC0000] TIME/FREQ = 0.10000[/highlight]
INITIAL JOBNAME = file
CURRENT JOBNAME = file
RESTART PROCEDURE RE-BUILDS BOUNDARY CONDITIONS
AND LOADING INFO UPTO THE CURRENT LOADSTEP
READ ANSYS LOADS DATA FROM FILE= file.ldhi
DELETE SOLID MODEL BOUNDARY CONDITIONS
….
SOLUTION MONITORING INFO IS WRITTEN TO FILE= file.mntr
*** LOAD STEP 11 SUBSTEP 1 COMPLETED. CUM ITER = 11
*** TIME = 1.10000 [highlight #CC0000] TIME INC = 0.100000[/highlight] NEW TRIANG MATRIX
*** RESPONSE EIGENVALUE = 796.3 OSCILLATION LIMIT = 79.63
FINISH SOLUTION PROCESSING
***** ROUTINE COMPLETED ***** CP = 34.109
*** ANSYS GLOBAL STATUS ***
TITLE = ConvRadSURF152Test–Thermisch-transient (E5)
ANALYSIS TYPE = TRANSIENT
NUMBER OF ELEMENT TYPES = 5
17120 ELEMENTS CURRENTLY SELECTED. MAX ELEMENT NUMBER = 21920
58666 NODES CURRENTLY SELECTED. MAX NODE NUMBER = 58666
17 COMPONENTS CURRENTLY DEFINED
MAXIMUM LINEAR PROPERTY NUMBER = 2
MAXIMUM REAL CONSTANT SET NUMBER = 4
ACTIVE COORDINATE SYSTEM = 0 (CARTESIAN)
NUMBER OF SPECIFIED CONSTRAINTS = 31087
NUMBER OF SPECIFIED SURFACE LOADS = 3520
CURRENT LOAD CASE = 0 OF 0
LOAD SET = 1
SUBSTEP = 1
[highlight #CC0000] TIME/FREQ = 0.10000[/highlight]
INITIAL JOBNAME = file
CURRENT JOBNAME = file
RESTART PROCEDURE RE-BUILDS BOUNDARY CONDITIONS
AND LOADING INFO UPTO THE CURRENT LOADSTEP
READ ANSYS LOADS DATA FROM FILE= file.ldhi
DELETE SOLID MODEL BOUNDARY CONDITIONS
NUMBER OF NODAL CONSTRAINTS DELETED = 31087
NUMBER OF ELEMENT CONVECTIONS/HEAT FLUXES DELETED = 1760
*** NOTE *** CP = 34.953 TIME= 06:49:36
The number of results set on the restart command is the last set on the
RTH file. No updating for the RTH file is required.
STEP BOUNDARY CONDITION KEY= 1
REFERENCE TEMPERATURE= 0.000 (TUNIF= 25.000)
INERTIA RELIEF KEY= 0
UNIFORM TEMPERATURE SET TO 25.0000000
ACEL= 0.0000 0.0000 0.0000
OMEGA= 0.0000 0.0000 0.0000
DOMEGA= 0.0000 0.0000 0.0000
CGLOC= 0.0000 0.0000 0.0000
CGOMGA= 0.0000 0.0000 0.0000
DCGOMG= 0.0000 0.0000 0.0000
SPECIFIED CONSTRAINT TEMP FOR SELECTED NODES 1 TO 1 BY 1
REAL= 30.0000000 IMAG= 0.00000000
SPECIFIED CONSTRAINT TEMP FOR SELECTED NODES 2 TO 2 BY 1
REAL= 30.0000000 IMAG= 0.00000000
…
SPECIFIED CONSTRAINT TEMP FOR SELECTED NODES 47685 TO 47685 BY 1
REAL= 70.0000000 IMAG= 0.00000000
SPECIFIED CONSTRAINT TEMP FOR SELECTED NODES 47686 TO 47686 BY 1
REAL= 70.0000000 IMAG= 0.00000000
NONE SELECT FOR ITEM=NODE COMPONENT=
IN RANGE 1 TO 58666 STEP 1
0 NODES (OF 58666 DEFINED) SELECTED BY NSEL COMMAND.
NONE SELECT FOR ITEM=ELEM COMPONENT=
IN RANGE 1 TO 21920 STEP 1
0 ELEMENTS (OF 17120 DEFINED) SELECTED BY ESEL COMMAND.
*** WARNING *** CP = 36.891 TIME= 06:49:38
Entity 100 is undefined. The ESEL command is ignored.
*** ANSYS – ENGINEERING ANALYSIS SYSTEM RELEASE 2021 R2 21.2 ***
Ansys Mechanical Enterprise Academic Teaching
00000000 VERSION=WINDOWS x64 06:49:39 MAR 25, 2023 CP= 37.094
ConvRadSURF152Test–Thermisch-transient (E5)
*** WARNING *** CP = 37.109 TIME= 06:49:39
Material number 5 (used by element 20161) should normally have at least
one MP or one TB type command associated with it. Output of energy by
material may not be available.
*** ANSYS – ENGINEERING ANALYSIS SYSTEM RELEASE 2021 R2 21.2 ***
Ansys Mechanical Enterprise Academic Teaching
00000000 VERSION=WINDOWS x64 06:49:39 MAR 25, 2023 CP= 37.375
ConvRadSURF152Test–Thermisch-transient (E5)
SOLUTION MONITORING INFO IS WRITTEN TO FILE= file.mntr
*** LOAD STEP 12 SUBSTEP 1 COMPLETED. CUM ITER = 12
*** TIME = 2.10000 [highlight #CC0000] TIME INC = 1.00000[/highlight] NEW TRIANG MATRIX
*** RESPONSE EIGENVALUE = 1298. OSCILLATION LIMIT = 1298.
FINISH SOLUTION PROCESSING
***** ROUTINE COMPLETED ***** CP = 39.297
I don't know why this is happening
With best regards
Steff