A two-dimensional numerical study of natural convection in a tunnel whose\nplane is sinusoidal with an opening on the horizontal ceiling is presented. In\nthis work, we study the thermoconvective instabilities of air in a tunnel closed\nat both ends and heated by the floor. The study was carried out for different\ncases of geometry by varying the thickness of the sinusoid and the height of\nthe tunnel. In order to create a transverse movement of the air, we heated the\nfloor to the temperature������
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