An LES study and ... in-line tube-banks 31 Fig. 8: Time history of C$_{D}$ , (a) C1,C2 (b) C3,C4 340 350 360 370 380 tu$_{g}$/D 0.5 0.0 0.5 1.0 1.5 2.0 2.5 ¯ C D ( a ) C1 C2 340 350 360 370 380 tu$_{g}$/D 0.5 0.0 0.5 1.0 1.5 2.0 2.5 ¯ C D ( b ) C3 C4