Vol. 39, issue 05, article # 3

Abstract:

Optical radiation propagating in the atmosphere is partially absorbed by air, thus heating it; at the same time, an optical radiation beam acts as a linear extended heat source. The resulting convective phenomena contribute to atmospheric turbulence. Indoors, this convective turbulence has features related to spatial limitations and the presence of other heat sources. In this paper, convective air motions in a vicinity of a group of linear extended optical sources in a horizontal configuration of an open-side room under external wind influence are studied by numerically solving three-dimensional Navier–Stokes equations. To parallelize the calculations, a computing cluster with MPI interface was used. Convective cells arising along inclined optical beams and the corresponding velocity and temperature fields are described. It was found that the shape and location of the cells are determined by the inclination of beams optical axis and the configuration of the room. The evolution of temperature and velocity fields is shown. Spatial spectra of temperature fluctuations in various directions, including in the vicinity of optical paths, are constructed. The causes are described and the mutual effects of the beams are estimated upon changes in the structural characteristic of air refractive index fluctuations in the vicinity of inclined optical paths. The influence of the external wind on the thermal traces of optical radiation beams inside and outside the room is considered. Upon completion of the numerical experiment, there is a turbulence inside the room with spectrum of temperature fluctuations similar to Kolmogorov spectrum. The considered situations can be observed in specialized rooms of optical systems when air is heated by optical radiation of varying intensity. The resulting turbulence fields of convective and dynamic nature significantly impact the operation of recording devices. The results are important for predicting the correct operation of such devices and for evaluating the mutual influence of optical beams.

Keywords:

convection, inclined optical beam, thermal trace

Figures:

References:

1. Whinnery J., Miller D., Dabby F. Thermal conveсtion and spherical aberration distortion of laser beams in low-loss liquids // IEEE J. Quantum Electron. 1967. V. 3, N 9. P. 382–383.
2. Vorob'ev V.V. Vliyanie nagreva turbulentnoi atmosfery svetovym puchkom na fluktuatsii ego intensivnosti // Kvant. elektron. 1972. N 7. P. 5–13.
3. Petrishchev V.A., Sheronova N.M., Yashin V.E. Eksperimental'noe izuchenie teplovogo samovozdeistviya v gaze v prisutstvii konvektsii // Izv. vuzov. Radiofiz. 1975. V. 18, N 7. P. 963–974.
4. Smith D.C. High-power laser propagation: Thermal blooming // IEEE Proc. 1977. V. 65, N 12. P. 1679–1714.
5. Konyaev P.A., Lukin V.P. Thermal distortions of focused laser beams in the atmosphere // Appl. Opt. 1985. V. 24, N 3. P. 415–421. DOI: 10.1364/AO.24.000415.
6. Lukin V.P. Atmosfernaya adaptivnaya optika. Novosibirsk: Nauka, 1986. 248 p.
7. Vorob'ev V.V. Teplovoe samovozdeistvie lazernogo izlucheniya v atmosfere. M.: Nauka, 1987. 200 p.
8. Lukin V.P., Fortes B.V. Iskajeniya fazy opticheskogo puchka pri ego samovozdeistvii v usloviyakh gravitatsionnoi konvektsii // Optika atmosf. i okeana. 1990. V. 3, N 12. P. 1307–1311.
9. Kucherov A.N., Makashev N.K., Ustinov E.V. Rasprostranenie opticheskogo puchka peremennogo radiusa v usloviyakh gravitatsionnoi konvektsii i obduva // Optika atmosf. i okeana. 1993. V. 6, N 12. P. 1536–1542.
10. Kucherov A.N. Rasprostranenie vertikal'nogo lazernogo puchka v gravitatsionno-konvektivnom potoke pogloshchayushchei sredy // Optika atmosf. i okeana. 1996. V. 9, N 8. P. 1110–1119.
11. Depierreux S., Labaune C., Michel D.T., Stenz C., Nicolaï P., Grech M., Riazuelo G., Weber S., Riconda C., Tikhonchuk V.T., Loiseau P., Borisenko N.G., Nazarov W., Hüller S., Pesme D., Casanova M., Limpouch J., Meyer C., Di-Nicola P., Wrobel R., Alozy E., Romary P., Thiell G., Soullié G., Reverdin C., Villette B. Laser smoothing and imprint reduction with a foam layer in the multikilojoule regime // Phys. Rev. Lett. 2009. V. 102, N 19. P. 195005. DOI: 10.1103/PhysRevLett.102.195005
12. Jones O.S., Kemp G.E., Langer S.H., Winjum B.J., Berger R.L., Oakdale J.S., Belyaev M.A., Biener J., Biener M.M., Mariscal D.A., Milovich J.L., Stadermann M., Sterne P.A., Wilks S.C. Experimental and calculational investigation of laser-heated additive manufactured foams // Phys. Plasm. 2021. V. 28, N 2. P. 022709. DOI: 10.1063/5.0032023.
13. Goncharskii A.V., Popov V.V., Stepanov V.V. Vvedenie v komp'yuternuyu optiku. M.: Izd-vo MGU, 1991. 312 p.
14. Volkov M.V., Garanin S.G., Kozlova T.I., Konoval'tsov M.I., Kopalkin A.V., Lebedev R.S., Starikov F.A., Techko O.L., Tyutin S.V., Khokhlov S.V., Tsykin V.S. Fazirovka izlucheniya 7-kanal'nogo optovolokonnogo lazera s dinamicheskimi turbulentnymi iskajeniyami fazy s ispol'zovaniem stokhasticheskogo parallel'nogo gradientnogo algoritma pri shirine polosy 450 kHz // Kvant. elektron. 2020. V. 50, N 7. P. 694–699. DOI: 10.1070/QEL17193.
15. Monin A.S., Yaglom A.M. Statisticheskaya gidromekhanika. V. 1. SPb.: Gidrometeoizdat, 1992. 696 p.
16. Monin A.S., Yaglom A.M. Statisticheskaya gidromekhanika. V. 2. SPb.: Gidrometeoizdat, 1996. 742 p.
17. Obukhov A.M. Atmosfernaya turbulentnost' // Turbulentnost' i dinamika atmosfery. L.: Gidrometeoizdat, 1988. P. 173–183.
18. Gershuni G.Z., Jukhovitskii E.M. Konvektivnaya ustoichivost' nesjimaemoi jidkosti. M.: Nauka, 1972. 393 p.
19. Mironov V.L. Rasprostranenie lazernogo puchka v turbulentnoi atmosfere. N.: Nauka, 1981. 246 p.
20. Gurvich A.S., Kon A.I., Mironov V.L., Khmelevtsov S.S. Lazernoe izluchenie v turbulentnoi atmosfere. M.: Nauka, 1976. 277 p.
21. Zuev V.E., Banakh V.A., Pokasov V.V. Atmosfernaya optika. V. 5. Optika turbulentnoi atmosfery. L.: Gidrometeoizdat, 1988. 271 p.
22. Zuev V.E., Krekov G.M. Opticheskie modeli atmosfery. L.: Gidrometeoizdat, 1986. 256 p.
23. Popinet S. Gerris: A tree-based adaptive solver for the incompressible Euler equations in complex geometries // J. Comput. Phys. 2003. V. 190, N 2. P. 572–600. DOI: 10.1016/S0021-9991(03)00298-5.
24. Nosov V.V., Lukin V.P., Nosov E.V., Torgaev A.V. Структура турбулентности над нагретыми поверхностями. Численные решения // Optika atmosf. i okeana. 2016. V. 29, N 1. P. 23–30. DOI: 10.15372/AOO20160103; Nosov V.V., Lukin V.P., Nosov E.V., Torgaev A.V. Turbulence structure over heated surfaces: Numerical solutions // Atmos. Ocean. Opt. 2016. V. 29, N 3. P. 234–243.
25. Petrishchev V.A., Piskunova L.V., Talanov V.I., Erm R.E. Chislennoe modelirovanie teplovogo samovozdeistviya v prisutstvii indutsirovannoi konvektsii // Izv. vuzov. Radiofiz. 1981. V. 24, N 2. P. 161–171.
26. Cooley J.W., Tukey J.W. An algorithm for the machine calculation of complex Fourier series // Math. Comput. 1965. V. 19. P. 297–301.
27. Tatarskii V.I. Rasprostranenie voln v turbulentnoi atmosfere. M.: Nauka, 1967. 548 p.
28. Nosov V.V., Grigor'ev V.M., Kovadlo P.G., Lukin V.P., Nosov E.V., Torgaev A.V. Astroklimat spetsializirovannykh pomeshchenii Bol'shogo solnechnogo vakuumnogo teleskopa. Pt. 1 // Optika atmosf. i okeana. 2007. V. 20, N 11. P. 1013–1021.
29. Kolmogorov A.N. Lokal'naya struktura turbulentnosti v nesjimaemoi vyazkoi jidkosti pri ochen' bol'shikh chislakh Reinol'dsa // Dokl. AN SSSR. 1941. V. 30, N 4. P. 299–303.
30. Obukhov A.M. O raspredelenii energii v spektre turbulentnogo potoka // Izv. AN SSSR. Ser. geograf. i geofiz. 1941. V. 5, N 4–5. P. 453–466.