Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.

Degree of Freedom Error in Capacitive Pressure sensor design

Please login with a confirmed email address before reporting spam

Hello everyone, I have just started my PhD and I have no enough background regarding comsol. I am working on Capacitive Pressure sensor. Design is very simple there are two conductors of copper and there is a dielectric layer of PDMS between these two conductor plates. I am apply pressure on the top boundary and expecting there will be some deformation in top conductor plate because of pressure. I am trying to findout how the capacitance changing with applied pressure. I have also attached the design image here. I am getting this error when i try to compute the study of my design

Undefined value found. - Detail: Undefined value found in the equation residual vector. There are 52015 degrees of freedom giving NaN/Inf in the vector for the variable comp1.spatial.u. at coordinates: (0,0,0.00014), (1.27451e-05,0,0.00014), (2.54902e-05,0,0.00014), (0,0,0.00015), (0,0,0.00016), ... There are 52015 degrees of freedom giving NaN/Inf in the vector for the variable comp1.spatial.v. at coordinates: (0,0,0.00014), (1.27451e-05,0,0.00014), (2.54902e-05,0,0.00014), (0,0,0.00015), (0,0,0.00016), ... There are 52015 degrees of freedom giving NaN/Inf in the vector for the variable comp1.spatial.w. at coordinates: (0,0,0.00014), (1.27451e-05,0,0.00014), (2.54902e-05,0,0.00014), (0,0,0.00015), (0,0,0.00016), ...



2 Replies Last Post 25.01.2019, 07:06 GMT-5
Jeff Hiller COMSOL Employee

Please login with a confirmed email address before reporting spam

Posted: 6 years ago 24.01.2019, 13:39 GMT-5

Hello Muhammad,

Can you post your .mph file?

Best,

Jeff

-------------------
Jeff Hiller
Hello Muhammad, Can you post your .mph file? Best, Jeff

Please login with a confirmed email address before reporting spam

Posted: 6 years ago 25.01.2019, 07:06 GMT-5

https://nuigalwayie-my.sharepoint.com/:u:/g/personal/m_farooq1_nuigalway_ie/EaF0JZ_S9HlNg5os0yTZYp0BHtnQ8kcQ7n70Vc8sJtYlLg?e=bIpnhw

File size is around 40MB so i have upload it on onedrive and shared the link

[https://nuigalwayie-my.sharepoint.com/:u:/g/personal/m_farooq1_nuigalway_ie/EaF0JZ_S9HlNg5os0yTZYp0BHtnQ8kcQ7n70Vc8sJtYlLg?e=bIpnhw](http://) File size is around 40MB so i have upload it on onedrive and shared the link

Note that while COMSOL employees may participate in the discussion forum, COMSOL® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team.