Leveraging modal structure similarity for simulation of spatially evolving wakes
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866917547925831680 |
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| author | Gola, Divyanshu Sarkar, Sutanu |
| author_facet | Gola, Divyanshu Sarkar, Sutanu |
| contents | We present a new methodology to enable efficient simulation of high Reynolds number wakes. In this approach, a body-exclusive hybrid simulation at Re = 5 x 10^4 is initialized using inflow fields reconstructed from a lower Reynolds number (Re = 5 x 10^3) body-inclusive simulation. Spectral Proper Orthogonal Decomposition (SPOD) is employed to identify dominant coherent structures, and a low-rank reconstruction generates physically meaningful inflow conditions. The resulting simulations accurately recover key large-scale flow, including the vortex shedding mode, and match the spectral content of a fully body-inclusive Re = 5 x 10^4 reference simulation beyond an adjustment region. SPOD eigenspectra confirm agreement across both low and high frequencies. This strategy achieves over an order-of-magnitude reduction in computational cost by avoiding direct high-Re body-inclusive simulations, offering a scalable framework for simulating complex wakes using low Re as well as reduced-order inflow prescriptions. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2509_24925 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Leveraging modal structure similarity for simulation of spatially evolving wakes Gola, Divyanshu Sarkar, Sutanu Fluid Dynamics We present a new methodology to enable efficient simulation of high Reynolds number wakes. In this approach, a body-exclusive hybrid simulation at Re = 5 x 10^4 is initialized using inflow fields reconstructed from a lower Reynolds number (Re = 5 x 10^3) body-inclusive simulation. Spectral Proper Orthogonal Decomposition (SPOD) is employed to identify dominant coherent structures, and a low-rank reconstruction generates physically meaningful inflow conditions. The resulting simulations accurately recover key large-scale flow, including the vortex shedding mode, and match the spectral content of a fully body-inclusive Re = 5 x 10^4 reference simulation beyond an adjustment region. SPOD eigenspectra confirm agreement across both low and high frequencies. This strategy achieves over an order-of-magnitude reduction in computational cost by avoiding direct high-Re body-inclusive simulations, offering a scalable framework for simulating complex wakes using low Re as well as reduced-order inflow prescriptions. |
| title | Leveraging modal structure similarity for simulation of spatially evolving wakes |
| topic | Fluid Dynamics |
| url | https://arxiv.org/abs/2509.24925 |