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Hi Guru,

Multi-Domain is a similar approach in RADIOSS.  The objective of the multi-domain (also called RAD2RAD) is to optimize the computational times of large models characterized by different mesh sizes and consequently very different time steps. The principle is to isolate in a global model a set of subdomains (/ SUBDOMAIN) whose mesh size deviation is sufficiently large, so that each of these subdomains is computed using its clean no time.

Please go through Example 45 - Multi-Domain in the Help Menu which shows  Multi-Domain technique. Model files are attached for your reference. 

bumper_LL4_0000.rad.zip

bumper_LL4_0001.rad.zip

FINE_MESH_0001.rad.zip

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