Error in vorticity calculation using curl function

Hi,

I am comparing the vorticity contours evaluated from velocity data using matlab's curl () function and pivmat's vec2scal function

Though, in both method, I am getting the similar contour, but the vorticity values are not correct. Could somebody help me with this ??. Image 1 generated using curl() and 2 generated using pivmat's vec2scal function..

[darova]

They look similar

Answer 1

[Sai Sumanth Korthiwada]

Hi,

The images attached in the query looks similar. However, the values of vorticity may differ as ‘curl()’ function is from MATLAB and ‘vec2scal()’ function is from PIVMat.

In ‘vec2scal()’ function, there is a scalar mode curl (or rot) : curl (z-component of vorticity field).

Try using ‘curl’ as an input argument to obtain the appropriate results. By default, if input argument ‘MODE’ is omitted, 'norm' (for a 2D field) or 'uz' (for a 3D field) is taken by default.