Hello I need help to solve this problem in my calculation. Here is what the output solver shows me. Thanks in advance for your help
Sortie du solveur
Ansys Mechanical Enterprise Academic Research
*------------------------------------------------------------------* | | | W E L C O M E T O T H E A N S Y S (R) P R O G R A M | | | *------------------------------------------------------------------*
*************************************************************** * ANSYS MAPDL 2022 R2 LEGAL NOTICES * *************************************************************** * * * Copyright 1971-2022 Ansys, Inc. All rights reserved. * * Unauthorized use, distribution or duplication is * * prohibited. * * * * Ansys is a registered trademark of Ansys, Inc. or its * * subsidiaries in the United States or other countries. * * See the Ansys, Inc. online documentation or the Ansys, Inc. * * documentation CD or online help for the complete Legal * * Notice. * * * *************************************************************** * * * THIS ANSYS SOFTWARE PRODUCT AND PROGRAM DOCUMENTATION * * INCLUDE TRADE SECRETS AND CONFIDENTIAL AND PROPRIETARY * * PRODUCTS OF ANSYS, INC., ITS SUBSIDIARIES, OR LICENSORS. * * The software products and documentation are furnished by * * Ansys, Inc. or its subsidiaries under a software license * * agreement that contains provisions concerning * * non-disclosure, copying, length and nature of use, * * compliance with exporting laws, warranties, disclaimers, * * limitations of liability, and remedies, and other * * provisions. The software products and documentation may be * * used, disclosed, transferred, or copied only in accordance * * with the terms and conditions of that software license * * agreement. * * * * Ansys, Inc. is a UL registered * * ISO 9001:2015 company. * * * *************************************************************** * * * This product is subject to U.S. laws governing export and * * re-export. * * * * For U.S. Government users, except as specifically granted * * by the Ansys, Inc. software license agreement, the use, * * duplication, or disclosure by the United States Government * * is subject to restrictions stated in the Ansys, Inc. * * software license agreement and FAR 12.212 (for non-DOD * * licenses). * * * ***************************************************************
SET PARAMETER DIMENSIONS ON _WB_USERFILES_DIR TYPE=STRI DIMENSIONS= 248 1 1
PARAMETER _WB_USERFILES_DIR(1) = D:\LUC\VT4x4\TRANSISTOR 8x60µm\TRANSISTOR 8x60µm_files\user_files\ --- Data in consistent uMKS units. See Solving Units in the help system for mor
uMKS UNITS SPECIFIED FOR INTERNAL LENGTH = MICROMETERS (um) MASS = KILOGRAM (kg) TIME = SECONDS (sec) TEMPERATURE = CELSIUS (C) TOFFSET = 273.0 FORCE = MICRONEWTON (uN) HEAT = PICOJOULES (pJ)
INPUT UNITS ARE ALSO SET TO UMKS
*** MAPDL - ENGINEERING ANALYSIS SYSTEM RELEASE 2022 R2 22.2 *** Ansys Mechanical Enterprise Academic Research 00000000 VERSION=WINDOWS x64 16:25:08 MAY 17, 2023 CP= 1.234
TRANSISTOR 8x60_m--Thermique stationnaire (E5)
***** MAPDL ANALYSIS DEFINITION (PREP7) ***** *********** Nodes for the whole assembly *********** *********** Elements for Body 1 "VIAHOLE31" *********** *********** Elements for Body 2 "VIAHOLE32" *********** *********** Elements for Body 3 "METTALISATION5" *********** *********** Elements for Body 4 "PONTTRANSISTOR1" *********** *********** Elements for Body 5 "SIN11" *********** *********** Elements for Body 6 "GRILLE11_8x60_m" *********** *********** Elements for Body 7 "GRILLE12_8x60_m" *********** *********** Elements for Body 8 "GRILLE13_8x60_m" *********** *********** Elements for Body 9 "GRILLE14_8x60_m" *********** *********** Elements for Body 10 "GRILLE15_8x60_m" *********** *********** Elements for Body 11 "GRILLE16_8x60_m" *********** *********** Elements for Body 12 "GRILLE17_8x60_m" *********** *********** Elements for Body 13 "GRILLE18_8x60_m" *********** *********** Elements for Body 14 "FIELDPLATE17" *********** *********** Elements for Body 15 "FIELDPLATE18" *********** *********** Elements for Body 16 "FIELDPLATE19" *********** *********** Elements for Body 17 "FIELDPLATE20" *********** *********** Elements for Body 18 "FIELDPLATE21" *********** *********** Elements for Body 19 "FIELDPLATE22" *********** *********** Elements for Body 20 "FIELDPLATE23" *********** *********** Elements for Body 21 "FIELDPLATE24" *********** *********** Elements for Body 22 "BCB1" *********** *********** Elements for Body 23 "METTALISATION9" *********** *********** Elements for Body 24 "SIN12" *********** *********** Elements for Body 25 "SIN13" *********** *********** Elements for Body 26 "SIN14" *********** *********** Elements for Body 27 "SIN15" *********** *********** Elements for Body 28 "SIN16" *********** *********** Elements for Body 29 "SIN17" *********** *********** Elements for Body 30 "SIN18" *********** *********** Elements for Body 31 "Au_SiC1" *********** *********** Elements for Body 32 "SiC1" *********** *********** Elements for Body 33 "GaN1" *********** *********** Elements for Body 34 "METTALISATION9" *********** *********** Send User Defined Coordinate System(s) *********** *********** Send Materials *********** *********** Send Named Selection as Element Component *********** *********** Send Named Selection as Node Component *********** *********** Send Named Selection as Node Component *********** *********** Define Temperature Constraint *********** *********** Create "Débit de chaleur" *********** ***************** Define Uniform Initial temperature ***************
***** ROUTINE COMPLETED ***** CP = 193.328
--- Number of total nodes = 1261772 --- Number of contact elements = 38402 --- Number of spring elements = 0 --- Number of bearing elements = 0 --- Number of solid elements = 7398122 --- Number of condensed parts = 0 --- Number of total elements = 7436524
PERFORM A STATIC ANALYSIS THIS WILL BE A NEW ANALYSIS
CONTACT INFORMATION PRINTOUT LEVEL 1
DO NOT SAVE ANY RESTART FILES AT ALL **************************************************** ******************* SOLVE FOR LS 1 OF 1 ****************
SPECIFIED CONSTRAINT TEMP FOR PICKED NODES REAL= 25.0000000 IMAG= 0.00000000
SELECT FOR ITEM=TYPE COMPONENT= IN RANGE 35 TO 35 STEP 1
38402 ELEMENTS (OF 7436524 DEFINED) SELECTED BY ESEL COMMAND.
SELECT ALL NODES HAVING ANY ELEMENT IN ELEMENT SET.
28825 NODES (OF 1261772 DEFINED) SELECTED FROM 38402 SELECTED ELEMENTS BY NSLE COMMAND.
GENERATE SURFACE LOAD HFLU ON SURFACE DEFINED BY ALL SELECTED NODES VALUE = 2.430555556E+10
NUMBER OF HFLU ELEMENT FACE LOADS STORED = 38402
ALL SELECT FOR ITEM=NODE COMPONENT= IN RANGE 1 TO 1261772 STEP 1
1261772 NODES (OF 1261772 DEFINED) SELECTED BY NSEL COMMAND.
ALL SELECT FOR ITEM=ELEM COMPONENT= IN RANGE 1 TO 8641640 STEP 1
7436524 ELEMENTS (OF 7436524 DEFINED) SELECTED BY ESEL COMMAND.
PRINTOUT RESUMED BY /GOP
USE AUTOMATIC TIME STEPPING THIS LOAD STEP
USE 1 SUBSTEPS INITIALLY THIS LOAD STEP FOR ALL DEGREES OF FREEDOM FOR AUTOMATIC TIME STEPPING: USE 10 SUBSTEPS AS A MAXIMUM USE 1 SUBSTEPS AS A MINIMUM
TIME= 1.0000
ERASE THE CURRENT DATABASE OUTPUT CONTROL TABLE.
WRITE ALL ITEMS TO THE DATABASE WITH A FREQUENCY OF NONE FOR ALL APPLICABLE ENTITIES
WRITE NSOL ITEMS TO THE DATABASE WITH A FREQUENCY OF ALL FOR ALL APPLICABLE ENTITIES
WRITE RSOL ITEMS TO THE DATABASE WITH A FREQUENCY OF ALL FOR ALL APPLICABLE ENTITIES
WRITE EANG ITEMS TO THE DATABASE WITH A FREQUENCY OF ALL FOR ALL APPLICABLE ENTITIES
WRITE VENG ITEMS TO THE DATABASE WITH A FREQUENCY OF ALL FOR ALL APPLICABLE ENTITIES
WRITE FFLU ITEMS TO THE DATABASE WITH A FREQUENCY OF ALL FOR ALL APPLICABLE ENTITIES
WRITE CONT ITEMS TO THE DATABASE WITH A FREQUENCY OF ALL FOR ALL APPLICABLE ENTITIES
CONVERGENCE ON HEAT BASED ON THE NORM OF THE N-R LOAD WITH A TOLERANCE OF 0.1000E-02 AND A MINIMUM REFERENCE VALUE OF 0.1000E+07 USING THE L2 NORM (CHECK THE SRSS VALUE)
*GET ANSINTER_ FROM ACTI ITEM=INT VALUE= 0.00000000
*IF ANSINTER_ ( = 0.00000 ) NE 0 ( = 0.00000 ) THEN
*ENDIF
***** MAPDL SOLVE COMMAND *****
*** WARNING *** CP = 295.484 TIME= 16:25:55 Element shape checking is currently inactive. Issue SHPP,ON or SHPP,WARN to reactivate, if desired.
*** NOTE *** CP = 300.734 TIME= 16:25:57 The sparse direct solver will make use of at most 1 GPU accelerator device during this shared-memory parallel solution. To use 2 GPU accelerator devices, as requested with the -na command line option, you must be running the sparse solver in distributed memory parallel processing.
*** ERROR *** CP = 308.391 TIME= 16:25:58 Zero volume in element 2722825.
*** ERROR *** CP = 323.656 TIME= 16:25:59 Zero volume in element 4426109.
*** ERROR *** CP = 323.875 TIME= 16:25:59 Zero volume in element 4427158.
*** ERROR *** CP = 324.516 TIME= 16:25:59 Zero volume in element 4430032.
*** ERROR *** CP = 324.516 TIME= 16:25:59 Zero volume in element 4430901.
*** ERROR *** CP = 324.953 TIME= 16:25:59 Zero volume in element 4432694.
*** ERROR *** CP = 325.172 TIME= 16:25:59 Zero volume in element 4434240.
*** ERROR *** CP = 363.219 TIME= 16:26:02 Zero volume in element 3571673.
*** ERROR *** CP = 392.625 TIME= 16:26:04 Zero volume in element 4832389.
*** ERROR *** CP = 393.438 TIME= 16:26:04 Zero volume in element 4837655.
*** ERROR *** CP = 396.484 TIME= 16:26:04 The model data was checked and there were errors found. Please check output or errors file ( D:\LUC\VT4x4\TRANSISTOR 8x60µm\_ProjectScratch\Scr4E95\file.err ) for messages.
NUMBER OF WARNING MESSAGES ENCOUNTERED= 1 NUMBER OF ERROR MESSAGES ENCOUNTERED= 11
***** PROBLEM TERMINATED BY INDICATED ERROR(S) OR BY END OF INPUT DATA *****
+--------------------- M A P D L S T A T I S T I C S ------------------------+
Release: 2022 R2 Build: 22.2 Update: UP20220516 Platform: WINDOWS x64 Date Run: 05/17/2023 Time: 16:26 Process ID: 18312 Operating System: Windows Server 2019 (Build: 17763)
Processor Model: Intel(R) Xeon(R) Gold 6246R CPU @ 3.40GHz
Compiler: Intel(R) Fortran Compiler Version 19.0.5 (Build: 20190815) Intel(R) C/C++ Compiler Version 19.0.5 (Build: 20190815) Intel(R) Math Kernel Library Version 2020.0.0 Product Build 20191125 BLAS Library supplied by Intel(R) MKL
Number of machines requested : 1 Total number of cores available : 64 Number of physical cores available : 32 Number of processes requested : 1 Number of threads per process requested : 16 Total number of cores requested : 16 (Shared Memory Parallel)
Number of GPUs requested : 2 GPU Acceleration: NVIDIA Library Requested and Enabled GPU Device with ID = 0 is: NVIDIA RTX A6000 GPU Driver Version: 11.70 CUDA Version: 11.0
Job Name: file Input File: dummy.dat Working Directory: D:\LUC\VT4x4\TRANSISTOR 8x60µm\_ProjectScratch\Scr4E95
Total CPU time for main thread : 55.4 seconds Total CPU time summed for all threads : 406.8 seconds
Elapsed time spent obtaining a license : 0.4 seconds Elapsed time spent pre-processing model (/PREP7) : 28.3 seconds Elapsed time spent solution - preprocessing : 9.7 seconds Elapsed time spent computing solution : 0.0 seconds Elapsed time spent solution - postprocessing : 0.0 seconds Elapsed time spent post-processing model (/POST1) : 0.0 seconds
Sum of memory used on all processes : 8694.0 MB Sum of memory allocated on all processes : 14400.0 MB Physical memory available : 256 GB
Total amount of I/O written to disk : 0.0 GB Total amount of I/O read from disk : 0.0 GB
+------------------ E N D M A P D L S T A T I S T I C S -------------------+
*---------------------------------------------------------------------------* | | | RUN COMPLETED | | | |---------------------------------------------------------------------------| | | | Ansys MAPDL 2022 R2 Build 22.2 UP20220516 WINDOWS x64 | | | |---------------------------------------------------------------------------| | | | Database Requested(-db) 1024 MB Scratch Memory Requested 1024 MB | | Maximum Database Used 4273 MB Maximum Scratch Memory Used 4421 MB | | | |---------------------------------------------------------------------------| | | | CP Time (sec) = 406.781 Time = 16:26:06 | | Elapsed Time (sec) = 61.000 Date = 05/17/2023 | | | *---------------------------------------------------------------------------*
Thank you for your feedback, but the link you put, I don't see a solution that was proposed.
May 18, 2023 at 12:44 pm
Ashish Khemka
Ansys Employee
Hi Luc,
Check the location of the zero-volume element in your model. If it is in a crucial part clean up your geometry and turn on the "Aggressive mechanical shape checking ON" for the mesher. Try to clean up the geometry and mesh it with better quality. Check whether the shape check is "ON" or "OFF". If it is "ON" turn it to "OFF" by adding a command: "SHPP OFF" through the command snippet. If it works run your simulation and check the the stress output at that location where the zero volume element was. If the part is not crucial you can work with that solution. But judge the solution properly. Tetrahedral mesh fills the pyramid space to grow tetrahedral from the pyramid surface and at times it selects the wrong node to create the tetrahedral mesh so we get a negative or flat element or element with skewness of 1 or an element with zero volume. I suggest you clear your mesh and try to do the meshing with the "high smoothing" option in the "sizing" under "mesh" in the workbench. This may help you to avoid the zero-volume elements. Try to mesh with hex mesh dominant because the tet element sometimes causes inaccurate results as they degenerate from the hex element. But avoid meshing thin structures with hex elements.
Regards,
Ashish Khemka
May 18, 2023 at 1:06 pm
LUC ARNAUD KAKOU
Subscriber
Thank you for your feedback,
I am using ansys 2022R2, I don't have much control over the different commands you mentioned below:
I'm using ansys 2022R2, I don't have much control over the different commands you mentioned below: "Check the location of the zero volume element in your model. If it is in a crucial part, clean up your geometry and activate the "Aggressive mechanical shape checking ON" function for the mesh. Try to clean up the geometry and mesh it with better quality. Check if the shape check is "ON" or "OFF". If it is "ON", set it to "OFF" by adding a command: "SHPP OFF" in the command snippet. If this works, run your simulation and check the constraints where the zero volume part was. If the part is not crucial, you can work with this solution.
As for the rest I know where to make the changes
Thanks in advance
Viewing 4 reply threads
You must be logged in to reply to this topic.
Ansys Innovation Space
Boost Ansys Fluent Simulations with AWS
Computational Fluid Dynamics (CFD) helps engineers design products in which the flow of fluid components is a significant challenge. These different use cases often require large complex models to solve on a traditional workstation. Click here to join this event to learn how to leverage Ansys Fluids on the cloud, thanks to Ansys Gateway powered by AWS.
Earth Rescue – An Ansys Online Series
The climate crisis is here. But so is the human ingenuity to fight it. Earth Rescue reveals what visionary companies are doing today to engineer radical new ideas in the fight against climate change. Click here to watch the first episode.
Ansys Blog
Subscribe to the Ansys Blog to get great new content about the power of simulation delivered right to your email on a weekly basis. With content from Ansys experts, partners and customers you will learn about product development advances, thought leadership and trends and tips to better use Ansys tools. Sign up here.
You are navigating away from the AIS Discovery experience