why we do second order tetra mesh? and why not we prefer first order tet mesh? what is the difference between these two?

Hello,

 

First you need to know the difference between the two.

 

First order elements have less number of nodes on them while second order elements have more number of nodes on them. 

 

We prefer Second order elements as because it has more number of nodes, it has better mapping abilities as well as gives us more accurate results as compared to the first order elements. This also means that the second order elements will increase the time of run of the analysis.

 

We also prefer as it does a better job in calculating complex results. But keep in mind that the run will take more time whenever we use second order elements.

 

Hope this solves your confusion.

 

Thankyou

 

 

 

Hi Sanjay Nainani...

 

ok thanks, but can you or anyone here explain in terms of shape functions and interpolation?

Do you need to ask such academic knowledge here?

these may help (ask google):

https://www.colorado.edu/engineering/CAS/courses.d/AFEM.d/AFEM.Ch09.d/AFEM.Ch09.pdf

https://www.colorado.edu/engineering/CAS/courses.d/AFEM.d/AFEM.Ch10.d/AFEM.Ch10.pdf

The first order elements follow a linear interpolation i.e. a straight line while the second order elements follow a curved line i.e. a higher order interpolation.

 

Also please refer the eBook Practical Aspects of Finite Element Simulation (A Study Guide). You can find more details on this from page 120.

 

thankyou