Hi,<\/p>\n
I am doing a system coupling simulation with Transient Structural and Fluent. I always use the fixed time stepping for system coupling (for example, dt = 0.001). Therefore, the system coupling setting overrides both mechanical and fluent settings. <\/p>\n
I often met cases where fluent met negative cell volume, where I needed to decrease dt in system coupling (dt_sc) thereby fluent dt to resolve. I already tried finer mesh resolution in interested region but negative cell volume may happen once FSI interface undergoes quick deformation. <\/p>\n
However, in simulation with fixed dt for system coupling, the mechanical solver can adaptively integrate with smaller dt till dt_sc in system coupling is reached, while fluent can only do dt_fluent = dt_sc. I noticed Fluent has an adaptive time stepping option, but my trial always results in a mismatch between fluent time and system coupling time. <\/p>\n
Can you tell me if I can do a fixed dt for system coupling, while fluent can do an adaptive dt to avoid negative cell volume issues?<\/p>\n
Thank you!<\/p>\n
Eric<\/p>\n","protected":false},"template":"","class_list":["post-374790","topic","type-topic","status-publish","hentry","topic-tag-2-way-coupled-fsi","topic-tag-autotimestepping-1","topic-tag-fluent","topic-tag-systemcoupling","topic-tag-transient-structural"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t