Re: DC resistivity modeling
Another Issue. If I consider electrodes placed in a container (box), so boundaries conditions are electric insulation everywhere, and I don't use a sink, comsol can't find a solution. In this case, I...
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Hi marios, I think there is any way to avoid this problem without using sink. If you don't create a sink or a special boundary condition (ground for exemple) there is no continuity, so you can't...
View ArticleRe: DC resistivity modeling
Hi marios, I think there is any way to avoid this problem without using sink. If you don't create a sink or a special boundary condition (ground for exemple) there is no continuity, so you can't...
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1) You can calculate Fréchet derivates (Jacobian matrix) with the adjoint state method (Park & Van, 1991), Or with the sensitivity equation method (McGillivray and Oldenburg, 1990). Comsol can...
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Hello Marios, As I said in my previous reply, I use the "postint" function. (with comsol V3.5) There is two way to use this function : 1) declare a volume with a string : Si,j = postint( fem , '...
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Thanks again for your reply. I am creating subdomains, where I calculate the integral (comsol 4.2, results-->derived values --> Volume integral) of let's say a wenner array like this...
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Hi marios, this is my personnal email : yannick.fargier@ifsttar.fr can you send me a mail, and I will send you a part of my code to compute the senstivity matrix (but not this week I will not have the...
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hi, I am wondering if the comsol can do the 3D resistivity inversion of ERT. If it can, how? Any clue or document or model or ... is welcome. Thank you in advance.
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Hi Yingying, I'm not sure comsol is best suited to do inversion (we speak about 100 to 50 000 inversion cell). So I don't have a model. But, comsol can solve the forward problem and matlab (with the...
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Hi Yingying, I am also looking for the same solution. If you have any information, kindly share with me as well. Many thanks Regards, Hafisoh
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I, too, would be interested in learning what progress you make with this problem. Comsol should give it some attention.
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There are three different replies on this topic. 1) Short answer is NO. 2) Long answer is yes with the help of maltab (you can export results there) and a parametric solver in comsol. There are several...
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I have got a simple problem which makes me struggle. I have a rectangular thin conductive sheet. I would like to calculate with COMSOL the electrical resistance between the corners of the conductive...
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Hi, i'm new to COMSOL. Working on image reconstruction, ERT. I would like to know how to create a number of cells (side by side, creating a square of cells in both x and y direction), so as to find the...
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In Comsol model library, there is a model named " aquifer_characterization". Square cells are made. You can refer to this model to build yours.
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Thank you much, Yingying Zhang In Comsol model library, there is a model named " aquifer_characterization". Square cells are made. You can refer to this model to build yours.
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Hi, how do i calculate my sensitivity? I have my derived values of current density norm for 8 electrodes. My formula is Vo = Vin(Rfb/Rf) where Rfb = 15k. I know my sensitivity has to be the (S = Vo of...
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Good Day, Working on electrical resistance tomography. a) In the attached model, I have defined 3 layers for cylinder geometry (cyl1). This automatically gives concentric cylinders which are seen to be...
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Dear Marios. I'm on ERT also with focus on sensitivity in flow pipelines. Any ideas on designing centroid of mass and reading coordinates w.r.t to centroid variables. Cheers I shifted the electrodes by...
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Dear Ayo. I'm on ERT with focus on sensitivity in flow pipelines. Any ideas on designing centroid of mass and reading coordinates w.r.t to centroid variables? Cheers Good Day, Working on electrical...
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