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 Demonstration of progressive tank filling where an air bubble gets trapped in a portion of the tank. ````Demonstration of progressive tank filling where an air bubble `gets trapped in a portion of the tank. The portion of the `tank where the air bubble forms is modeled as a separate tank `and its load level is calculated with respect to the pressure `in the air bubble. project TANKTRAP enter pm loa 999 create tank1a.s loc @ 0 = 0 0, 20,0, 20,30, 10,30, 10,10, 0,10 loc @ 10 = 0 0, 20,0, 20,30, 10,30, 10,10, 0,10 tube 5,15,0, 5,15,30 / create tank1b.s loc @ 0 = 0 10, 10,10, 0,12 loc @ 10 = 0 10, 10,10, 0,12 / write tanktrap.gf quit pm display variable ds, ds1, y, k, v0, dh1, l1 set k = 33.9 times 1.025 `Head of water per atmosphere of pressure. macro bubble `%1 - sounding in main tank `%2 - height ABL of bottom of bubble tank `%3 - full volume of bubble tank set ds = %1 minus %2 minus {ds1} `Effective head above bottom of bubble tank if {ds}<0 then load 0 | exit set y = {ds} div {k} plus 1 `Pressure in atmospheres set y = %3 div {y} `Volume of air V = V0/P set y = %3 minus {y} `Volume of water load vol:{y} set ds1 = minus {height} `Level of water above bubble tank's bottom / macro bload1 `%1 - bubble tank name `%2 - height of bottom of bubble tank above bottom of sounding tube `%3 - longitudinal center of tank for viewing cross section tank %1 ref bottom load 1 set v0 = {tvolume} `maximum volume of air bubble set dh1 = %2 set l1 = %3 / macro bload2 `%1 - sounding `%2 - name of main tank `%3 - name of bubble tank load (%2) snd:%1 `load main portion of tank by sounding tank %3 set ds1=0 .bubble (3) %1, {dh1}, {v0} `do the bubble macro multiple (3) times to converge ds1 display (*) status body @ {l1} /yesempty / .bload1 tank1b.s, 10, 5 .bload2 (6,4) 9, tank1a.s, tank1b.s end ``` Add a free link to your site