https://communities.bentley.com/products/offshore/f/maxsurf-moses-sacs-forum/136802/current-does-not-affect-to-mooring-lineHello I am try to calculate mooring line force by b_cat mooring But changing direction and velocity of current does not make any difference of output generated by ST_CFORCE i entered data like below &amp;data environment environment sea10 -seaen-USTelligent Community 12https://communities.bentley.com/thread/414356?ContentTypeID=1Fri, 02 Jun 2017 00:00:56 GMT6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:b824e39b-4fad-47d1-8dfa-b08da2056d5bkim hyun joongThank you for your answer<br /> <br /> I found that my question does not describe what i want to know properly.<br /> <br /> When I input current and wind, it affect to hull and hull should be drift by this effect.<br /> <br /> due to differences of hull position, mooring line shape will be changed, then some mooring line will burden more load <br /> <br /> I want to know &#39;drift due to wind or current can be checked in frequency domain??&#39;<div style="clear:both;"></div>https://communities.bentley.com/thread/414286?ContentTypeID=1Thu, 01 Jun 2017 12:29:13 GMT6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:5a73ecb9-732a-45af-84f9-8dc012982eeaGnaneswar sambhanai think u should look into definition of mooring line , in b_cat there is option called -buoydia , here you have input equvalant diameter such that drag and lift force is acuratly calculated for mooring line<div style="clear:both;"></div>