MANTRA ARCHIVE
ME 303 FLUID DYNAMICS/ WESTPHAL/ WSU/ FALL 2000
Former ME 303 student Tony Graham has suggested that the "mantras" be listed in a single archive.
OK! The most recent are listed first (i.e., reverse chronological order). I'll try to keep this up-to-date; if you see that
I've missed one, e-mail me at westphal@wsu.edu.
"PARASITIC DRAG = FRICTION DRAG + FORM DRAG ... ALL AT ZERO LIFT"
"TOTAL DRAG = INDUCED DRAG + PARASITIC (ZERO-LIFT) DRAG"
"INDUCED DRAG IS AN UNAVOIDABLE CONSEQUENCE FOR REAL (FINITE SPAN) LIFTING WINGS"
"LIFT EQUALS WEIGHT AND THRUST EQUALS DRAG IN STEADY LEVEL FLIGHT"
"LIFT AND SIDEFORCE ARE (MUTUALLY PERPENDICULAR) COMPONENTS OF THE FORCE RESULTANT IN THE PLANE PERPENDICULAR TO RELATIVE FLUID MOTION"
"DRAG IS THE COMPONENT OF THE FORCE RESULTANT IN THE DIRECTION OF RELATIVE FLUID MOTION"
"NEVER LOOK A GIFT PI IN THE MOUTH"
"MANNING'S EQUATION IS *NOT* DIMENSIONALLY HOMOGENEOUS"
"NUMBER OF PIS EQUALS NUMBER OF RELEVANT PARAMETERS MINUS NUMBER OF INDEPENDENT DIMENSIONS"
"NPSHA > NPSHR TO AVOID CAVITATION... NPSHR FROM PUMP MANUFACTURER"
"USE *ABSOLUTE* SUCTION PRESSURE (AND VAPOR PRESSURE) IN NPSHA CALCULATION"
"PUMP NPSHA = PRESSURE HEAD PLUS VELOCITY HEAD MINUS VAPOR PRESSURE HEAD, ALL AT SUCTION"
"PUMP HEAD MINUS TURBINE HEAD = CHANGE IN TOTAL HEAD PLUS LOSSES"
"CONSERVATION OF MOMENTUM IS A *VECTOR* EQUATION"
"PRESSURE WITHIN A JET ISSUING INTO A STAGNANT AMBIENT EQUALS AMBIENT PRESSURE"
"STAGNATION (TOTAL) EQUALS STATIC PLUS DYNAMIC"
"PRESSURE VARIATION IS HYDROSTATIC NORMAL TO STRAIGHT STREAMLINES"
"PRESSURE DROPS IN DIRECTION TOWARD CENTER OF CURVATURE AND NORMAL TO STREAMLINES"
"BERNOULLI S EQUATION APPLIES ALONG A PARTICULAR STREAMLINE IN STEADY, CONSTANT-DENSITY SIMPLE FLOW"
"MDOT EQUALS RHO TIMES A TIMES V-REL... THAT'S VELOCITY *RELATIVE* TO THE CS"
"BOUYANCY EQUALS WEIGHT OF *DISPLACED* FLUID"
"PRESSURE RESULTANT ON A SUBMERGED FLAT SURFACE ACTS PERPENDICULAR TO THE SURFACE, BELOW CENTROID BY Ixc/(Yc A )"
"PRESSURE RESULTANT ON A SUBMERGED FLAT SURFACE EQUALS PRESSURE AT CENTROID TIMES AREA"
"SHEAR STRESSES OPPOSE THE MOTION"
"SHEAR STRESSES ARE PROPORTIONAL TO RELATIVE MOTION"
"A FLUID SUPPORTS NO SHEAR STRESS AT REST"
"PRESSURE IS THE NORMAL, COMPRESSIVE STRESS WITHIN A FLUID"
"CREATION RATE EQUALS OUTFLOW MINUS INFLOW PLUS RATE OF INCREASE OF STORAGE"
"ALWAYS INSERT NUMBERS WITH THEIR UNITS INTO DIMENSIONALLY HOMOGENEOUS ("GOOD") EQUATIONS"