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-The hydrodynamic coefficients C_d and C_m are not only dependent on the size of slender cylin-der,its location in water,KC number and Re number,but also vary with environmental conditions,i.e.,in regular waves or in irregular waves,in pure waves or in wave-current coexisting field.In this paper,thenormalization of hydrodynamic coefficients for various environmental conditions is discussed.When aproper definition of KC number and proper characteristic values of irregular waves are used,a unified re-lationship between C_d,C_m and KC number for regular waves,irregular waves,pure waves and wave-cur-rent coexisting field can be obtained.
-The hydrodynamic coefficients C_d and C_m are not only dependent on the size of slender cylin-der, its location in water, KC number and Re number, but also vary with environmental conditions, ie, in regular waves or in irregular waves, in pure waves or in wave-current coexisting field. In this paper, then normalization of hydrodynamic coefficients for various environmental conditions is discussed. What is aproper definition of KC number and proper characteristic values of irregular waves are used, a unified re-lationship between C_d, C_m and KC number for regular waves, irregular waves, pure waves and wave-cur-rent coexisting field can be.