Hi, I'm student , I tried use a vortex core in tecplot, but it says that the variables of my data are not recognized. I should puts in a especial order the components velocities, in the set information? Order of my variables, x,y,z,u,v,w
Hello there, I am trying to plot Lambda 2 criterion but when a run the equation it showed errors like >,< = symbols are only allowed in first parameter of the IF() Function. any idea
Hi Nikan, The algorithm used in the video identifies the vortex cores based on the eigenmodes of the tensor of velocity gradient. Tecplot uses MIT's FX library for that. The AIAA 99-3288 paper by Robert Haimes describes the relations. Have a nice day!
Can anybody explain me why Tecplot subtracts Omega^2 from S^2 instead of adding it . According to the definition of Lamda2 criterion it is based on eigenvalues of S^2+Omega^2.
Dear Yuri, As the rotation-rate tensor Omega is antisymmetric, a minus sign is found in some Omega^2 terms. This is where the minus signs come from in the S^2+Omega^2 equations. Best,
@@GeniasGraphics I get the reason why you need to minus the Omega^2 terms rather than plus in original definition. If I use another programming language (e.g. Python or Matlab), I could directly calculate S^2 and Omega^2 simply by matrix multiplication, right?
This is wonderful video, very helpful Thank you
Great video tutorial....thank you very much
Hi, I'm student , I tried use a vortex core in tecplot, but it says that the variables of my data are not recognized. I should puts in a especial order the components velocities, in the set information? Order of my variables, x,y,z,u,v,w
Is the final methodology where you are using the equations actually the q-criterion?
Hello there, I am trying to plot Lambda 2 criterion but when a run the equation it showed errors like >,< = symbols are only allowed in first parameter of the IF() Function. any idea
Thanks a lot, this helped me
Merci, nous sommes à votre disposition pour toute question: info@genias-graphics.de
Great video, Is the vortex core the region where vorticity is at a certain value or is it a region that encompasses a range of vorticity values?
Hi Nikan,
The algorithm used in the video identifies the vortex cores based on the eigenmodes of the tensor of velocity gradient. Tecplot uses MIT's FX library for that. The AIAA 99-3288 paper by Robert Haimes describes the relations.
Have a nice day!
nice video
Can anybody explain me why Tecplot subtracts Omega^2 from S^2 instead of adding it . According to the definition of Lamda2 criterion it is based on eigenvalues of S^2+Omega^2.
Dear Yuri,
As the rotation-rate tensor Omega is antisymmetric, a minus sign is found in some Omega^2 terms.
This is where the minus signs come from in the S^2+Omega^2 equations.
Best,
@@GeniasGraphics I get the reason why you need to minus the Omega^2 terms rather than plus in original definition. If I use another programming language (e.g. Python or Matlab), I could directly calculate S^2 and Omega^2 simply by matrix multiplication, right?