A PLANE223 piezoelectric model that ran successfully at release 10 no longer runs at release 11. I now get the following error message: *** ERROR *** CP = 187.844 TIME= 12:20:09 There are elements with negative and positive electric charge reaction solutions for the VOLT degree of freedom inthe model. This analysis is not valid. Why is this happening?
March 17, 2023 at 8:59 amFAQParticipant
Your model has two components – a pair of electrodes and the piezoelectric substrate atop which they reside. Both the electrodes and piezoelectric substrate are modeled with PLANE223, keyoption(1)=1001. There is a new feature for PLANE223 at v11 â€“ electroelastic coupling (useful for the simulation of electrostatically actuated MEMS devices). This is now the default behavior for PLANE223 when keyopt(1)=1001 AND when no piezoelectric properties are defined [TB,PIEZ]. For this option, the element nodal electric reaction (or â€œthrough variableâ€ if you prefer) is positive charge (see table 223.2 in the V11 Elements Reference). The electrodes in your model were defined in this manner. If you define a piezo matrix [TB,PIEZ], this option of PLANE223 becomes piezoelectric and has negative electriccharge as its nodal electric reaction. This is the option you used to define the piezoelectric substrate in your model. The conflicting reaction variables make the results that would be obtained from this combination of element types meaningless, hence the error trap.
Introducing Ansys Electronics Desktop on Ansys Cloud
The Watch & Learn video article provides an overview of cloud computing from Electronics Desktop and details the product licenses and subscriptions to ANSYS Cloud Service that are...
How to Create a Reflector for a Center High-Mounted Stop Lamp (CHMSL)
This video article demonstrates how to create a reflector for a center high-mounted stop lamp. Optical Part design in Ansys SPEOS enables the design and validation of multiple...
Introducing the GEKO Turbulence Model in Ansys Fluent
The GEKO (GEneralized K-Omega) turbulence model offers a flexible, robust, general-purpose approach to RANS turbulence modeling. Introducing 2 videos: Part 1 provides background information on the model and a...
Postprocessing on Ansys EnSight
This video demonstrates exporting data from Fluent in EnSight Case Gold format, and it reviews the basic postprocessing capabilities of EnSight.
- The warning message is: “The maximum contact stiffness is too big. This may affect the accuracy of the results.” Why does large contact stiffness affect results accuracy?
- After Workbench crashes, how can I recover the project from a .mechdb file?
- Contact Definitions in ANSYS Workbench Mechanical
- Model has a large number of contacts – how to reduce them?
- How to resolve “Error: Invalid Geometry”?
- How to display the color of each body based on the material in Mechanical?
- How to locate an element of a particular ID number in Mechanical?
- Please explain the warning message “coefficient ratio exceeds 10e8” ?
- How to Connect Excel to Workbench
- How can I plot bodies colored by material property in Workbench?
© 2023 Copyright ANSYS, Inc. All rights reserved.