{"id":428740,"date":"2025-04-12T15:36:28","date_gmt":"2025-04-12T15:36:28","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/morison-hull-drag-coefficient-in-ansys-aqwa\/"},"modified":"2025-04-12T15:36:28","modified_gmt":"2025-04-12T15:36:28","slug":"morison-hull-drag-coefficient-in-ansys-aqwa","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/morison-hull-drag-coefficient-in-ansys-aqwa\/","title":{"rendered":"Morison hull drag coefficient in Ansys Aqwa"},"content":{"rendered":"<p>&lt;p&gt;In Ansys Aqwa, there is an option to account for drag forces on the diffracting structure. Here,&lt;\/p&gt;&lt;ul class=&#8221;marker:text-textOff list-disc&#8221;&gt;<\/p>\n<li>&lt;p class=&#8221;my-0&#8243;&gt;<strong>X_X<\/strong>: Force (coefficient) in the X-direction (surge) due to velocity in the X-direction.&lt;\/p&gt;<\/li>\n<li>&lt;p class=&#8221;my-0&#8243;&gt;<strong>Y_Y<\/strong>: Force in the Y-direction (sway) due to velocity in the Y-direction.&lt;\/p&gt;<\/li>\n<li>&lt;p class=&#8221;my-0&#8243;&gt;<strong>Z_Z<\/strong>: Force in the Z-direction (heave) due to velocity in the Z-direction.&lt;\/p&gt;<\/li>\n<li><strong>RX_RX<\/strong>: Moment about the X-axis (roll) due to angular velocity about the X-axis.<\/li>\n<li><strong>RY_RY<\/strong>: Moment about the Y-axis (pitch) due to angular velocity about the Y-axis.<\/li>\n<li><strong>RZ_RY<\/strong>: Moment about the Z-axis (yaw) due to angular velocity about the Z-axis.&lt;br&gt;Is this the correct interpretation? I am unable to understand how to fill this matrix for an asymmetric body.&lt;br&gt;how to calculate the rotation drag coefficient? i.e. (Rx_RX), (RY_RY) and (RZ_RZ)? from fluent.<\/li>\n<li>&nbsp;From fluent, 3 forces and 3 moments are obtained by flow along X(surge ), and it can be updated in the matrix, similarly for surge and heave. But how to update the entry of rotational RX-RX or off-diagonal RX_RY, etc?&lt;br&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/04\/12-04-2025-1744471008-hull.png\" alt=\"\" \/><\/li>\n<\/ul>\n","protected":false},"template":"","class_list":["post-428740","topic","type-topic","status-publish","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27791"],"_bbp_topic_id":["428740"],"_bbp_subscription":["228162","180344"],"_bbp_author_ip":["203.110.242.12"],"_bbp_last_reply_id":["428860"],"_bbp_last_active_id":["428860"],"_bbp_last_active_time":["2025-04-14 14:34:29"],"_bbp_reply_count":["1"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["228162","180344"],"_btv_view_count":["172"],"_bbp_topic_status":["unanswered"]},"test":"ashwingurjar1407kgpian-iitkgp-ac-in"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/428740","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/428740\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=428740"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}