In various embodiments, center body assemblies are described herein. The center body assembly may include an attachment ring, a center body, and a cavity structure. The center body may be configured to be coupled to the attachment ring. The cavity structure may be configured to be coupled to the attachment ring. The cavity structure may be configured to be separated from the center body by a gap. The center body and the cavity structure may be configured to expand independently of each other in response to an increase in temperature. In various embodiments, the cavity structure may comprise a baffle. In various embodiments, the center body may comprise a baffle.