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Combine Two Parametric Solutions from Two Separate mph projects

Posted 15 sept. 2022, 12:33 UTC−4 1 Reply

Michael Sonnenberg
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Hello,

Is there a way to combine two frequency domain parametric sweep solutions from two separate mph projects? I completed 1/3 Octave ISO frequencies 200-6300Hz in a study, and then I re-ran this study on 8000 and 10kHz after the fact, because I was concerned they would not converge and didn't want that to break my Matlab Livelink loop. I technically ran 11 unique 200-6300Hz parametric solutions via Matlab Livelink for-loop and saved them all as individual mph projects. I just re-ran one of these at 8000 and 10kHz and was pleasantly surprised it converged. Now I have two mph projects with two solutions that together encompass the frequency range I am interested in. I appreciate any recommendations.

-Michael

1 Reply Last Post 30 sept. 2022, 03:30 UTC−4
Remi Magnard COMSOL Employee

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Posted: 3 years ago 30 sept. 2022, 03:30 UTC−4

Dear Michael,

See below a script that illustrates how to combine the solutions of two models using the COMSOL API in MATLAB:

% Load source model
model1 = mphopen('open_pipe_solve1','Model1');
model2 = mphopen('open_pipe_solve2','Model2');
% Load destination model
model =  mphopen('open_pipe_solve1','ModelFull');
% Get Parameter list
PVals1 = model1.sol('sol1').getPVals;
PVals2 = model2.sol('sol1').getPVals;
% Construct thenew full list of parameters and set it to the source model
PVals = [PVals1;PVals2(2:end)];
model.sol('sol1').setPVals(PVals);
% Extract solution vectors in source models and set them in the destination 
n = length(PVals1);    
for i = 1:n;
    U = model1.sol('sol1').getU(i);
    model.sol('sol1').setU(i,U);
end   
for i=2:length(PVals2);
    U = model2.sol('sol1').getU(i);
    model.sol('sol1').setU(n+i-1,U);
end
% Create the solution
model.sol('sol1').createSolution;

Note that you could also have both solutions available within the same model, in this case use the Combine Solutions study step to generate a new solution, see the attached model combine_solution.mph (the model solution is reset to reduce its size, so you need to run Study 1, Study 2, and then Study 3).

Best regards,

Rémi

Dear Michael, See below a script that illustrates how to combine the solutions of two models using the COMSOL API in MATLAB: % Load source model model1 = mphopen('open_pipe_solve1','Model1'); model2 = mphopen('open_pipe_solve2','Model2'); % Load destination model model = mphopen('open_pipe_solve1','ModelFull'); % Get Parameter list PVals1 = model1.sol('sol1').getPVals; PVals2 = model2.sol('sol1').getPVals; % Construct thenew full list of parameters and set it to the source model PVals = [PVals1;PVals2(2:end)]; model.sol('sol1').setPVals(PVals); % Extract solution vectors in source models and set them in the destination n = length(PVals1); for i = 1:n; U = model1.sol('sol1').getU(i); model.sol('sol1').setU(i,U); end for i=2:length(PVals2); U = model2.sol('sol1').getU(i); model.sol('sol1').setU(n+i-1,U); end % Create the solution model.sol('sol1').createSolution; Note that you could also have both solutions available within the same model, in this case use the Combine Solutions study step to generate a new solution, see the attached model combine_solution.mph (the model solution is reset to reduce its size, so you need to run Study 1, Study 2, and then Study 3). Best regards, Rémi

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