Back to Search
Start Over
Improved algorithm for solving nonlinear parabolized stability equations
- Source :
- Chinese Physics B. 25:084701
- Publication Year :
- 2016
- Publisher :
- IOP Publishing, 2016.
-
Abstract
- Due to its high computational efficiency and ability to consider nonparallel and nonlinear effects, nonlinear parabolized stability equations (NPSE) approach has been widely used to study the stability and transition mechanisms. However, it often diverges in hypersonic boundary layers when the amplitude of disturbance reaches a certain level. In this study, an improved algorithm for solving NPSE is developed. In this algorithm, the mean flow distortion is included into the linear operator instead of into the nonlinear forcing terms in NPSE. An under-relaxation factor for computing the nonlinear terms is introduced during the iteration process to guarantee the robustness of the algorithm. Two case studies, the nonlinear development of stationary crossflow vortices and the fundamental resonance of the second mode disturbance in hypersonic boundary layers, are presented to validate the proposed algorithm for NPSE. Results from direct numerical simulation (DNS) are regarded as the baseline for comparison. Good agreement can be found between the proposed algorithm and DNS, which indicates the great potential of the proposed method on studying the crossflow and streamwise instability in hypersonic boundary layers.
- Subjects :
- Hypersonic speed
Direct numerical simulation
Stability (learning theory)
General Physics and Astronomy
Boundary (topology)
01 natural sciences
010305 fluids & plasmas
Physics::Fluid Dynamics
Nonlinear system
Robustness (computer science)
Distortion
0103 physical sciences
Applied mathematics
Mean flow
010306 general physics
Mathematics
Subjects
Details
- ISSN :
- 16741056
- Volume :
- 25
- Database :
- OpenAIRE
- Journal :
- Chinese Physics B
- Accession number :
- edsair.doi...........5efa6053e981898524e5753d605101df