Error Singular Matrix Comsol
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Поддержка Контакты Community > Discussion Forum > Failed to find a solution: Singular MATRIX. Discussion Forum Filter by Topic Release Popular Topics 5.2a 5.2 5.1 5.0 4.4 4.3b 4.3a 4.3 4.2a 4.2 4.1 4.0a 4.0 3.5a AC/DC ModuleAcoustics ModuleCFDChemical Reaction EngineeringDefinitions and operatorsFluid
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FlowGeometryHeat TransferLiveLink productsMaterials and functionsMEMSMeshMicrofluidicsPhysicsResults and visualizationRF ModuleSolvingStructural Mechanics List all singular matrix error matlab discussions Share this pageEmailLinkedInFacebookTwitterDeliciousDiggStumbleuponMore services... Failed to find a solution: Singular MATRIX. Topics: 4.2a, Fluid Flow, singular matrix error ltspice Heat Transfer, Mesh, Solving Thread index | Previous thread | Next thread | Start a new discussion RSS feed | Turn on email notifications https://www.comsol.com/support/knowledgebase/953/ | 10 Replies Last post: August 8, 2012 5:36am UTC Patricia Hernandez August 3, 2012 11:15am UTC Failed to find a solution: Singular MATRIX. Hi, I am Patricia and I am a new Comsol user. I am modelling the cooling scenario of a low voltage AC drives.To simplify the calculations and to obtain https://www.comsol.ru/community/forums/general/thread/30757/ easier results, I have carried out many approximations: air flows between two parallel and vertical plates ignoring the different elements between both plates, box at the top left which dissipates heat and a fan in the bottom of the device which produces the cooling, hence, there is forced convection. I was modelled on the example of "Convection Cooling of Circuit Boards". I solved 2 days ago and I obtained the temperature and velocity graphs. However, today I wanted to solve again (I didn't do any modification) and I have the next error: " Failed to find a solution. Singular matrix. There are 27 equations giving NaN/Inf in the matrix rows for the variable mod1.u. at coordinates: (0.00973619,0.290431), (0.013152,0.296094), (0.0114327,0.298224), (0.017299,0.290132), (0.0218176,0.283247), ... There are 27 equations giving NaN/Inf in the matrix rows for the variable mod1.v. at coordinates: (0.00973619,0.290431), (0.013152,0.296094), (0.0114327,0.298224), (0.017299,0.290132), (0.0218176,0.283247), ... There are 28 degrees of freedom giving NaN/Inf in the matrix columns for the variable mod1.T. at coordinates: (0.00973619,0.290431)
I avoid a singular matrix error in dsolve/numeric/bvp? Edit Posted: July 21 2010 by snackman 0 Product: Maple 13 0 I've been trying to numerically solve (and then plot) this set of equations, to reproduce results from a http://www.mapleprimes.com/questions/95285-How-Do-I-Avoid-A-Singular-Matrix-Error scientific paper (Berro et al., BPJ 2007). Maple tells me that some matrix is singular - any idea what I can do differently? Any help much appreciated. > eqn1 := 15*(diff(theta(s), `$`(s, 2))) = N3(s)*cos(theta(s))-N1(s)*sin(theta(s)); > eqn2 := diff(N1(s), s) = 0; > eqn3 := diff(N3(s), s) = 0;> eqn4 := diff(x(s), s) = cos(theta(s));> eqn5 := diff(z(s), s) = sin(theta(s));> eqns := {eqn1, eqn2, eqn3, eqn4, eqn5};> bcns singular matrix := {x(0) = 0, x(1.5) = 1, z(0) = 0, z(1.5) = 0, theta(0) = 0, theta(1.5) = 0};> sol := dsolve(`union`(eqns, bcns), [theta(s), N1(s), N3(s), x(s), z(s)], numeric, range = 0 .. 1.5, method = bvp[middefer]);%;Error, (in dsolve/numeric/bvp) matrix is singular> error differential_equation singular + Manage Tags Short words that describe your content. Used to categorize content. Combine multiple words with dashes(-). Separate tags with spaces. Tools Answer error singular matrix Reply Share Branch Create a new Post in reply Ask a related Question Flag More Contact Author Generate PDF 5945 views Preview You must enter a body with at least 15 characters That username is already taken by another member User name doesn't fit requirements Title: Comment: Enter your comment below. For information on using the editor, view the MaplePrimes Help. Subscribe: E-mail me when new comments are added to this You do not yet have a MaplePrimes user name, one is required to post to MaplePrimes, please enter one here. User Name: Cancel Preview Submit Answer this Question Add a Comment Preview You must enter a body with at least 15 characters That username is already taken by another member User name doesn't fit requirements Title: Comment: Enter your comment below. For information on using the editor, view the MaplePrimes Help. Subscribe: E-mail me when new comments are added to this You do not yet have a MaplePrimes user name, one is required to post to MaplePrimes, please enter one here. User Name: Cancel Preview Submit Share via: Share via e-mail: From: To: Custom Message (optional): Share on Facebook: You must be logged into your Facebook account in order to share via Facebook. L