{"id":157650,"date":"2020-08-21T08:42:08","date_gmt":"2020-08-21T08:42:08","guid":{"rendered":"\/forum\/forums\/topic\/natural-ventilation-coupled-with-mechanical-ventilation-2\/"},"modified":"2020-08-26T09:04:45","modified_gmt":"2020-08-26T09:04:45","slug":"natural-ventilation-coupled-with-mechanical-ventilation-2","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/natural-ventilation-coupled-with-mechanical-ventilation-2\/","title":{"rendered":"Natural ventilation coupled with mechanical ventilation"},"content":{"rendered":"<div class=\"Item-Body\">\n<div class=\"Message userContent\">\n<p>Hello, I&#039;m reasearching the natural ventilation coupled with mechanical ventilation &quot;FAN&quot;. The pressure difference between the external and internal pressures is the stack pressure available which can be created naturally by density differences to drive a ventilation flow through the building. Unfortunately, this stack effect in multi-storey buildings arises from the buoyancy forces which influence on the efficiency of the &quot;small FAN&quot; (imagine these in the bathroom). When I solve the model equations my solution gives information about the velocity distribution from the buoyancy forces, temperature distribution, pressure etc.&nbsp;<\/p>\n<p>Everything looks good, but when I coupled some FAN as boundary conditions I would like to check what is the difference between the flow rate of every single FAN at the floors. The floors are five, the fans are 5, I add intake fan boundary conditions and add pressure jump for characteristics of the FAN. But there isn&#039;t influence from the inlet velocity if I compare with only natural ventilation.&nbsp;<\/p>\n<p>Some boundary conditions I miss or something I have to repair in the cell zone condition I&#039;ll be glad to help me. Regards!<\/p>\n<div class=\"embedExternal embedImage\">\n<div class=\"embedExternal-content\">\n<a class=\"embedImage-link\" href=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/YBTQHHZZVVZZ\/2.jpg\" rel=\"nofollow noopener\" target=\"_blank\"><br \/>\n<img decoding=\"async\" class=\"embedImage-img\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/YBTQHHZZVVZZ\/2.jpg\" alt=\"2.jpg\" \/><br \/>\n<\/a><\/p>\n","protected":false},"template":"","class_list":["post-157650","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hello, I&#039;m reasearching the natural ventilation coupled with mechanical ventilation &quot;FAN&quot;. The pressure difference between the external and internal pressures is the stack pressure available which can be created naturally by density differences to drive a ventilation flow through the building. Unfortunately, this stack effect in multi-storey buildings arises from the buoyancy forces which influence\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/natural-ventilation-coupled-with-mechanical-ventilation-2\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.10\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"Ansys Learning Forum | Ansys Innovation Space\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"Natural ventilation coupled with mechanical ventilation | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"Hello, I&#039;m reasearching the natural ventilation coupled with mechanical ventilation &quot;FAN&quot;. The pressure difference between the external and internal pressures is the stack pressure available which can be created naturally by density differences to drive a ventilation flow through the building. Unfortunately, this stack effect in multi-storey buildings arises from the buoyancy forces which influence\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/natural-ventilation-coupled-with-mechanical-ventilation-2\/\" \/>\n\t\t<meta property=\"og:image\" content=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/YBTQHHZZVVZZ\/2.jpg\" \/>\n\t\t<meta property=\"og:image:secure_url\" content=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/YBTQHHZZVVZZ\/2.jpg\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2020-08-21T08:42:08+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2020-08-26T09:04:45+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Natural ventilation coupled with mechanical ventilation | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"Hello, I&#039;m reasearching the natural ventilation coupled with mechanical ventilation &quot;FAN&quot;. The pressure difference between the external and internal pressures is the stack pressure available which can be created naturally by density differences to drive a ventilation flow through the building. Unfortunately, this stack effect in multi-storey buildings arises from the buoyancy forces which influence\" \/>\n\t\t<meta name=\"twitter:image\" content=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/YBTQHHZZVVZZ\/2.jpg\" \/>\n\t\t<script type=\"application\/ld+json\" class=\"aioseo-schema\">\n\t\t\t{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/natural-ventilation-coupled-with-mechanical-ventilation-2\\\/#breadcrumblist\",\"itemListElement\":[{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"position\":2,\"name\":\"Topics\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/natural-ventilation-coupled-with-mechanical-ventilation-2\\\/#listItem\",\"name\":\"Natural ventilation coupled with mechanical ventilation\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"name\":\"Home\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/natural-ventilation-coupled-with-mechanical-ventilation-2\\\/#listItem\",\"position\":3,\"name\":\"Natural ventilation coupled with mechanical ventilation\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"name\":\"Topics\"}}]},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#organization\",\"name\":\"Ansys Learning Forum\",\"description\":\"Ansys Innovation Space\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/natural-ventilation-coupled-with-mechanical-ventilation-2\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/natural-ventilation-coupled-with-mechanical-ventilation-2\\\/\",\"name\":\"Natural ventilation coupled with mechanical ventilation | Ansys Learning Forum\",\"description\":\"Hello, I'm reasearching the natural ventilation coupled with mechanical ventilation \\\"FAN\\\". 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