CRG
Mechanical
- Sep 28, 2002
- 512
I currently have problems with finding solutions using the solve block, “Given ____ Find.” The problem is when I have equations in the solve block that very far apart in their solutions. Example: a solve block used to calculate flow would have variables with solutions of 10^7 for one variable and other variables with solutions in the order of 10^-6. The existing solve block will not solve these types of equations together in a solve block. The solve block can handle any single equation by it self; however, not when combined into a single block. To be more specific the equations are Reynolds number, Colebrook equation, General Flow Equation for compressible fluids, Velocity, and minor friction losses. I have tried to change TOL, CTOL, and initial guesses with no success. There is only one solution for the set of equations, and I have been manually iterating for the solution of dP or Flow depending on the problem. Just seems a shame that I either do not know how to use the tools of the program or the program will not work as advertised. When I try “Given ____ Minerr”, the program give an incorrect solution.
I was in hopes of not having to write a program to do what a solve block is supposed to do. Do you have any suggestions? I contacted the folks at MathCad and ask if there were any improvements from 2001i to the current version that might help, and they said no.
I was in hopes of not having to write a program to do what a solve block is supposed to do. Do you have any suggestions? I contacted the folks at MathCad and ask if there were any improvements from 2001i to the current version that might help, and they said no.
