| 摘要 |
A swirling flow identification apparatus includes an eigenequation calculation section 3 and a swirl axis calculation section 4 . The eigenequation calculation section 3 , based on velocity data of a fluid at a coordinate point, calculates an eigenvalue through an eigenequation concerning the coordinate point and the velocity data. The swirl axis calculation section 4 , if the eigenvalue is a complex number, defines an imaginary part of the complex number as a swirl function, calculates a coordinate point providing a local maximum value in the swirl function and defines the coordinate point providing the local maximum value as the position of a swirling axis of a swirling flow in the fluid. With this, even under the presence of another flow or a plurality of swirling flow, the swirling flow can be adequately identified by using the velocity vector at each of node points (coordinate points). |
