V.E Menu Options

We list DELTAE's menu options in the order in which they appear.

(r)un model

instructs DELTAE to begin its computation, adjusting the elements of the guess vector until either all targets are met or an error condition is reached. If one or two plot-independent variables are set, DELTAE will step through them.

(w)rite current model state

saves the current state in a .out file. If the file already exists, you will be given the option of overwriting or renaming it.

(n)ew model input file

brings a new .in (or .out file from the disk. If changes have been made in the current model, the user will be prompted to save it first.

(T)olerances/debugging

DELTAE has numerous internal parameters that can be altered by the experienced user to control the amount of diagnostic information printed or the behavior of DELTAE's solver. The dialog that appears for this command looks like this, if we keep all the default values by hitting <CR>:

Nprint <= 0, save only converged endpoint to .dat file.
Nprint > 0, save and display every Nprint intermediate iterations; also 
If Nprint < 0, the iteration vector line is omitted.
Nprint =  -1?  

If PlotDat>=0, all error messages are announced.
 Otherwise, they are only written to the .dat file.
If PlotDat>=1, all converged endpoints are written to the .dat file.    
 (for PlotDat=0, only the most recent)
PlotDat =   0?  

Convergence tolerance (1.e-2 > tol > 1.5e-7 recommended):
Tolerance =    .300E-03
New value (<CR> to keep)=? 

Number of Runge-Kutta steps (should be even:)
Nint =  10?  

Normalization mode:  1=standard; 2=special
mode =   1?  

Solver step bound factor (.01-100 recommended):
Bound =    100.    
New value (<CR> to keep)=? 

(Larger values of FCNerr can speed iterations, with a
slightly less accurate endpoint.  Too small a value
 can cause the solver to loose its way completely.)
Solver assumed function error (>5.e-15):
FCNerr =    .100E-09
New value (<CR> to keep)=?

For further details of the effect of each of these parameters, refer to the discussion in Chapter IV.

(g)eometry file

causes X-Y points representing a simple sketch of the model to be written to a file ending in .geo. Plotted using most any graphing software, these points will give a visual feel for the shape of the design. See the Section IV.G for an example plot and discussion.

(d)isplay

shows information on the screen. It prompts the user to select the .dat file (option d), the .plt file (option p), the entire .out file (option o), or a single segment in .out-file format (option <CR>and then the segment number). On PCs, these screens have an automatic pause feature after 23 lines are typed-press <CR>to continue, or `q' to quit the display. There is no `backup' yet.

(o)utput to printer

is the same as ``display" above, but for a printed copy instead of screen display.

(f)orm feed printer

makes the printer finish the page and spit it out after doing an ``output to printer."

(t)hermophysical properties

is used to look at properties of any gas, liquid, or solid supported by DELTAE. The user is prompted to select material, temperature, pressure, etc., with current values as defaults, selectable with a carriage return. Data are displayed on the screen in this format:

FLUID: 0.880hexe  , 302.0 K, 20.000 bar 
gamma  a(m/s) rho(kg/m^3) cp(J/kg/K) beta(1/K) k0(W/m/K) Prandtl mu(kg/s/m)
 1.67  465.91     15.356     1078.2  .3311E-02   .10586  .2604473 2.5572E-05
Frequency=   0.16 Hz, delta_nu=  1.8250E-03 m, delta_kappa=  3.5760E-03 m
Print this? (y/n):

(e)xit DeltaE

returns us to the computer's operating system, prompting for several choices of saving the current model state.

(p)lot another parameter

adds another parameter to the plot. When a number and capital letter is selected, its variable is added to the list of dependent plot variables. When a number and lower case letter is selected, its variable is used as an independent plot variable, and the user is prompted to choose it as either inner or outer loop variable, and to give its beginning, ending, and increment (or decrement) values.

(P)lot status summary

simply displays the current plot status on the screen.

(c)lear from vectors and plots

is used to eliminate variables from the guess vector, the target vector, the plot dependent-variable list, or the plot independent-variable list. Remember to use lower-case letters when selecting guesses or plot independent variables, and capital letters for targets and plot dependent variables.

(C)lear|set all guesses& targets

clears everything from the guess and target vectors, if they contain anything. This is most useful in the early stages of model development: If DELTAE doesn't converge, return to your initial guesses (they may be way out of line by now), clear everything, run it, and examine the results to see if one particular segment is giving ridiculous results due to a typographical error in the .in file. If the model has empty vectors after a previous (C)lear, selecting this option again causes DELTAE to generate a set of default iteration vectors appropriate to the model.

(u)se in guess/result vector

allows the user to add a new variable to the guess vector (using a number and lower-case letter) or to the target vector (using a number and capital letter).

(v)ector status summary

shows the current members of the guess and target vectors on the screen.

(m)odify parameter value

followed by a segment number and lower-case line letter allows the user to change the value of a guess or input variable.

(s)pecial modes editing

allows parameter linking modes to be set for any address (segment number and parameter letter) that accepts them. Special modes allow geometric relationships to be maintained when parameters are changed by the solver, by the user, or as an independent plot loop variable.

(D)OS command shell

temporarily suspends DELTAE and executes a new DOS command environment. This is intended to let the user examine files that are part of other models (not available under (d)isplay), to run plotting software on recent results, etc., without having to save all changes and leave DELTAE. To return to the program, type exit.