A Modal One-Way Navier-Stokes Approach to Modelling Non-Modal Boundary Layer Instabilities
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arXiv
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| author | Badcock, E. J. Mughal, S. |
| author_facet | Badcock, E. J. Mughal, S. |
| contents | This paper presents a method to solve the modal form of the linearised one-way Navier-Stokes (OWNS) equations for investigating disturbance development in developing subsonic and supersonic boundary layers. The modal framework offers significant advantages in robustness and computational efficiency over the conventional non-modal OWNS framework. Notably, we demonstrate that modal OWNS (M-OWNS) retains the capability to capture non-modal disturbance development. Our technique leverages the modal ansatz of parabolised stability equations (PSE) whilst employing the recursion-parameter parabolisation strategy of non-modal OWNS to stabilise the streamwise-marching modal algorithm. A key contribution is that we overcome the minimum streamwise step-size requirement that constrains conventional PSE in capturing short-scale disturbance evolution. We demonstrate through canonical test cases that fine-scale variations in the baseflow can be captured effectively. The M-OWNS procedure permits arbitrarily small streamwisemarching step-sizes whilst maintaining stability. Crucially, we find the algorithm to be more robust than conventional non-modal OWNS, whilst recovering identical modal and non-modal phenomena. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_12605 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | A Modal One-Way Navier-Stokes Approach to Modelling Non-Modal Boundary Layer Instabilities Badcock, E. J. Mughal, S. Fluid Dynamics Numerical Analysis This paper presents a method to solve the modal form of the linearised one-way Navier-Stokes (OWNS) equations for investigating disturbance development in developing subsonic and supersonic boundary layers. The modal framework offers significant advantages in robustness and computational efficiency over the conventional non-modal OWNS framework. Notably, we demonstrate that modal OWNS (M-OWNS) retains the capability to capture non-modal disturbance development. Our technique leverages the modal ansatz of parabolised stability equations (PSE) whilst employing the recursion-parameter parabolisation strategy of non-modal OWNS to stabilise the streamwise-marching modal algorithm. A key contribution is that we overcome the minimum streamwise step-size requirement that constrains conventional PSE in capturing short-scale disturbance evolution. We demonstrate through canonical test cases that fine-scale variations in the baseflow can be captured effectively. The M-OWNS procedure permits arbitrarily small streamwisemarching step-sizes whilst maintaining stability. Crucially, we find the algorithm to be more robust than conventional non-modal OWNS, whilst recovering identical modal and non-modal phenomena. |
| title | A Modal One-Way Navier-Stokes Approach to Modelling Non-Modal Boundary Layer Instabilities |
| topic | Fluid Dynamics Numerical Analysis |
| url | https://arxiv.org/abs/2511.12605 |