hi, i m regulerly facing a negative volume error in my turbine model which is not allowing the solver to run ........ how can i solve this using pro-amm

To solve a problem, first you have to find what causes it? if you agree on that principle, then take a look at your linear algebra book under the heading scalar triple product play a bit with the numbers, see by yourself how negative volumes are produced then you would be able to solve your negative volume problems, this is called experience. Good Luck