The .#.asens file is an OptiStruct ASCII format results file.
This file is created when an optimization is performed. Creation of this file is controlled by the I/O option OUTPUT.
The file contains sensitivity information for all responses with respect to topology design variables (density) at a given iteration (denoted by the # in the file name).
The sensitivities are listed in a single column and are grouped by response. A blank line separates each response grouping.
The # in the file name is the iteration number.