Incompatible Part,Mat and Prop, More Than One Element Type in Comp
Hi,
I am attempting to work with SPH to get stresses in the side walls of a hopper car. When I run my model (attached), I get the following error. The model checker says that there components with more than one element type for half of my shell components. The other half have the error 'Part, Mat, and prop incompatible.' I used the mask toolbar to see if there are any other elements than 2D, however it doesn't find any. Please let me know if you have suggestions.
Thanks in advance!
.. BLOCK FREE FORMAT
.. STARTER RUNNING ON 1 THREAD
.. CONTROL VARIABLES
ERROR ID : 286
** ERROR IN INPUT CONSISTENCY
DESCRIPTION :
QUAD ARE NOT COMPATIBLE WITH N2D3D=0
.. UNITS SYSTEM
.. MATERIALS
.. NODES
.. PROPERTIES
.. 2D SOLID ELEMENTS
.. 3D SHELL ELEMENTS
.. 3D TRIANGULAR SHELL ELEMENTS
.. SPH PARTICLES DEFINITION
.. SUBSETS
.. ELEMENT GROUPS
.. PART GROUPS
.. SURFACES
.. NODE GROUP
.. BOUNDARY CONDITIONS
.. INITIAL VELOCITIES
.. DOMAIN DECOMPOSITION
.. ELEMENT GROUPS
.. INTERFACES
.. INTERFACE BUFFER INITIALIZATION
.. RIGID BODIES
.. RETURNS TO DOMAIN DECOMPOSITION FOR OPTIMIZATION
.. DOMAIN DECOMPOSITION
.. ELEMENT GROUPS
.. INTERFACES
.. INTERFACE BUFFER INITIALIZATION
.. RIGID BODIES
.. ELEMENT BUFFER INITIALIZATION
ERROR ID : 227
** ERROR IN QUAD ELEMENT
** ERROR TRAPPED : REPORT TO LISTING FILE
ERROR ID : 760
==== End of solver screen output ====
==== Job completed ====
Answers
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Update:
I solved the majority of the above problems, however now I am getting Error 668 and 53 when I run it. See attached.
Thanks in advance.
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Hi
Please attach the .0000.out file and correct input file ,The attached model doesn't have SPH elements
there are few free edges in the model do correct it
Regarding error 668 and 53 go through these post
https://community.altair.com/community?id=community_question&sys_id=22864c3a1b2bd0908017dc61ec4bcbff
https://community.altair.com/community?id=community_question&sys_id=a996807a1b2bd0908017dc61ec4bcba00 -
Hi Pooja,
Thank you for the help. It seems for some reason my SPH was not defined as an /SPHCEL, so it was not working properly. Here is the updated model with all internal free edges resolved. My problem now is that the simulation takes 5 days to complete (and so I cannot attach a complete .out file). Is this due to the high volume of elements? Do I need to coarsen my mesh or conduct a model order reduction?
Thanks,
Ayman
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Hi
0000.out is the file which gives the summary of the FE model created (property, materials, parts, contacts, time step...) and summary of load cases in the form of warnings and/or error messages ,
please do attach the 0001.rad file to check about the run time , do cross verify the unit system consistency before carry out the run
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Hi,
in explicit method the timestep is affected by characteristic element length, stiffness and density. Please go through the timestep chapter in Free eBook: Crash Analysis With RADIOSS – A Study Guide.
In the model you shared there are rings of very narrow elements with bad aspect ratios and smaller characteristic element length penalizing timestep. Remeshing these areas is recommended.
In the edited model attached I have set up nodal mass scaling (DT/NODA/CST) and advanced mass scaling (AMS and DT/AMS). Note that AMS does not increase time step of SPH.
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Hi,
Sorry for the late reply, not sure if this thread is still active. I got rid of the narrow elements, however I have some geometry that is very stubborn. I may need to delete certain elements in non-critical areas and replace them with MPCs. The thing is, I have been unable to find specifically how to create MPCs in RADIOSS on the forum aside from here:
https://community.altair.com/community?id=dd86c83a1b2bd0908017dc61ec4bcbbf
I also tried to find any webinars on it. The link in the above thread is dead.
Could anyone advise me on how to create MPCs?
Thanks in advance!
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Altair Employee