Search found 98 matches

by rodion
Fri Oct 30, 2020 12:07 am
Forum: code_saturne usage
Topic: Internal coupling spurious velocity
Replies: 7
Views: 4039

Re: Internal coupling spurious velocity

Hello Luciano, Another option to stop any momentum in the solid is to impose a high negative implicit source term for the momentum conservation equation as it is described in [Patankar, S., 1980. Numerical Heat Transfer and Fluid Flow. Hemisphere Publishing Corporation, Washington, D.C.] The part of...
by rodion
Thu May 07, 2020 3:55 pm
Forum: code_saturne usage
Topic: How can I modify the equation for electric potential?
Replies: 14
Views: 9407

Re: How can I modify the equation for electric potential?

Hello Yvan, Thanks a lot for your explanations. It is clear now. I will try to implement all these new things and get back to this thread to tell what I got. Best regards, Rodion Update: Okay, I implemented the equation for effective field in the model. In fact it didn't work as intended. It resulte...
by rodion
Wed May 06, 2020 6:12 pm
Forum: code_saturne usage
Topic: How can I modify the equation for electric potential?
Replies: 14
Views: 9407

Re: How can I modify the equation for electric potential?

Dear Yvan, Thanks a lot for the answer. It is surprising how much I did not know about the gradient computation in Code_Saturne, even though I looked into it for a while. In the source code I can see that cgdcel is called by gradient_s in case without potential-type values and without weighting. Als...
by rodion
Wed May 06, 2020 12:05 am
Forum: code_saturne usage
Topic: How can I modify the equation for electric potential?
Replies: 14
Views: 9407

Re: How can I modify the equation for electric potential?

Hello Yvan, Sorry, I meant cs_gradient_scalar or _gradient_scalar . I guess I have to use cs_gradient_scalar , right? Also if I assume the homogeneous Neumann boundary condition, does it mean that I have to assign bc_coeff_a=0 and bc_coeff_b=1? Furthermore, is there any way to call cs_gradient_scala...
by rodion
Mon May 04, 2020 10:15 pm
Forum: code_saturne usage
Topic: How can I modify the equation for electric potential?
Replies: 14
Views: 9407

Re: How can I modify the equation for electric potential?

Hello Yvan, Thanks a lot for your answer. The low-level gradient function that you are talking about, is it cs_field_gradient_scalar or cs_gradient_scalar or cs_gradient_scalar ? I think in my case the homogeneous Neumann boundary condition should be alright. It is the zero flux boundary condition, ...
by rodion
Mon May 04, 2020 2:13 am
Forum: code_saturne usage
Topic: How can I modify the equation for electric potential?
Replies: 14
Views: 9407

Re: How can I modify the equation for electric potential?

Hello Yvan, Thanks a lot for your comment. Unfortunately I am still using Code_Saturne 5.0.9 on Windows. The transition to the version 6.0 or 6.1 and to Linux will take some more time, since I have to wait for the end of the lock-down/confinement in France to create a WSL machine on the multiprocess...
by rodion
Sun May 03, 2020 11:55 pm
Forum: code_saturne usage
Topic: How can I modify the equation for electric potential?
Replies: 14
Views: 9407

Re: How can I modify the equation for electric potential?

Hello Erwan, Thank you very much for your response. The thing is that the factor (σ*k/e)*Q(he) is known for each cell and it depends on the enthalpy (or temeprature, does not matter). But this factor does not depend on the electric potential φ, since it is a parameter of plasma and not of the electr...
by rodion
Sun Apr 26, 2020 2:03 am
Forum: code_saturne usage
Topic: How can I modify the equation for electric potential?
Replies: 14
Views: 9407

Re: How can I modify the equation for electric potential?

Hello Erwan, Thank you very much for your response. Basically I am trying to add the effect of electron pressure on the electric field. The current form of the equation for electric potential φ is: div(σ∇φ)=0 (1) Or if we write it in terms of electric field div(σ E )=0 I am trying to replace the ele...
by rodion
Tue Mar 31, 2020 3:05 am
Forum: code_saturne usage
Topic: How can I modify the equation for electric potential?
Replies: 14
Views: 9407

How can I modify the equation for electric potential?

Hello everyone, I work with simulation of electric arc plasma torches and currently I am trying to improve the theory of the electric arc model of Code_Saturne, For that I developed a two-temperature model (one temperature fore electrons and one temperature for heavy species) of electric arc in Code...
by rodion
Sun Mar 10, 2019 11:40 pm
Forum: code_saturne usage
Topic: Electric potential scaling in case of two temperature electric arc simulation
Replies: 1
Views: 1399

Electric potential scaling in case of two temperature electric arc simulation

Hello evereone, I am developing a two temperature model of electric arc in Code_Saturne. In this model I have two thermal scalars: electron enthalpy and heavy species enthalpy. These two scalars have diffferent diffusivity and different source terms. The source term for electrons is Joule power and ...