{"id":739,"date":"2026-04-01T10:39:00","date_gmt":"2026-04-01T01:39:00","guid":{"rendered":"https:\/\/www.muratasoftware.com\/en_wacul_new\/fwp-new-wacul\/?post_type=case&#038;p=739"},"modified":"2026-08-20T11:11:34","modified_gmt":"2026-08-20T02:11:34","slug":"ber005","status":"publish","type":"case","link":"https:\/\/www.muratasoftware.com\/en\/case\/ber005\/","title":{"rendered":"Diffusion Analysis of Material"},"content":{"rendered":"\n<figure class=\"wp-block-table blockPattern__table\"><table><thead><tr><th>General<\/th><th>Femtet ver.2022 has had a new function of diffusion analysis which handles passive scalar.<br>This example analyzes a distribution of nitrogen concentration in the experimental room where nitrogen of 100% concentration has been generated.<\/th><\/tr><\/thead><tbody><tr><td>Analysis Model<\/td><td>The container on the desk at the center of the experimental room is set to generate gas. Inflow\/outflow conditions are set in the room where local ventilation by draft chambers, air conditioning, and air venting are simulated.<\/td><\/tr><tr><td>Result<\/td><td>The result shows nitrogen concentration is low in the vicinity of air conditioners, air vents, and local ventilators.<br>The result also shows nitrogen concentration is high at the back of a desk where air stagnates or flows in the direction opposite to the airflow of the air conditioner.<\/td><\/tr><tr><td>Keywords<\/td><td>Diffusion Analysis,Passive Scalar,Ventilation<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-2 is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure data-wp-context=\"{&quot;imageId&quot;:&quot;6abb6cb50e2d2&quot;}\" data-wp-interactive=\"core\/image\" data-wp-key=\"6abb6cb50e2d2\" class=\"wp-block-image size-full wp-lightbox-container\"><img loading=\"lazy\" decoding=\"async\" width=\"960\" 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