Solving PDE w/ complex Neumann boundary condition
6 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
Hi,
I am working on combustion instabilities and therefore looking into eigenmodes. To solve for the pressure distribution u, I have to define my boundary conditions. As I understood from the Mathworks website, the Neumann BC is written in a general form as grad(u) + q * u = g. I am able to solve for real values of q (and I'm setting g=0), this being one of my BC:
neumann = [1 0 6 6 '0.1000' '0.0000']';
Can anybody tell me if there is a possibility to extent q values to imaginary values and thus q = q_r + iq_i?
Regards,
Simon R2011a
0 Kommentare
Akzeptierte Antwort
Bill Greene
am 17 Aug. 2013
Hi,
The expression within the single quotes has to be a valid MATLAB arithmetic expression. To define a complex number in MATLAB do either:
a + i*b
or
a + sqrt(-1)*b
The second form can be useful when the variable i has been redefined for some other purpose such as a loop index. So, in some ways, it is safer.
Bill
0 Kommentare
Weitere Antworten (3)
Bill Greene
am 16 Aug. 2013
Hi,
Yes, PDE Toolbox allows the BC (or PDE) coefficients to be imaginary. Are you running into a particular problem?
Bill
0 Kommentare
Siehe auch
Kategorien
Mehr zu Boundary Conditions finden Sie in Help Center und File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!