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Showing results 1 to 25 of 735 Search took 0.03 seconds. Search: Posts Made By: Amir

Forum: FLUENT February 12, 2015, 04:02

Replies: 11 Solving a Laplace equation for a scalar quantity Views: 3,942 Posted By Amir Hi, For sure you cannot solve it separately,... Hi, For sure you cannot solve it separately, but if you want to see the scalar values in a specified direction, you can simply draw a line and plot the scalar values over it... Bests,

Forum: Main CFD Forum December 21, 2014, 05:06

Replies: 27 SES - Subway Environment Simulation Views: 17,935 Posted By Amir Dear Juan, Please check your private message... Dear Juan, Please check your private message inbox...

Forum: FLUENT October 30, 2014, 15:33

Replies: 15 imposing 'Robin' or 'Mixed' BC Views: 2,557 Posted By Amir This is gradient of species mass fraction! ... This is gradient of species mass fraction! Please take a look at the UDF manual for more info... Bests,

Forum: FLUENT October 2, 2014, 13:34

Replies: 11 Solving a Laplace equation for a scalar quantity Views: 3,942 Posted By Amir Dear Mark, "UDS" is "User-Defined Scalar"... Dear Mark, "UDS" is "User-Defined Scalar" equation and is available in FLUENT, something like energy equation and totally different from "UDF"! In the process of enabling a UDS, you can manage the...

Forum: Fluent UDF and Scheme Programming August 21, 2014, 07:48

Replies: 25 strain rate magnitude Views: 35,588 Posted By Amir Hi, You need to put the Message command inside... Hi, You need to put the Message command inside your loop, not out of that! Moreover, this is "\n" not "/n". Bests,

Forum: Fluent UDF and Scheme Programming August 19, 2014, 10:40

Replies: 25 strain rate magnitude Views: 35,588 Posted By Amir I guess, proper definition of the Og tensor as... I guess, proper definition of the Og tensor as Og[ND_ND][ND_ND] and an initialization of this tensor may fixed this issue! However, I wonder how your UDF may lead to such error during the...

Forum: Fluent UDF and Scheme Programming August 18, 2014, 08:33

Replies: 25 strain rate magnitude Views: 35,588 Posted By Amir Hi, No, this is quite straight-forward! Just... Hi, No, this is quite straight-forward! Just substitute the S_mm term with sum of the diagonal components. i.e., S_mm=S11+S22+S33 kronecker_delta_ij=0, where i/=j kronecker_delta_ij=1, where...

Forum: OpenFOAM July 17, 2014, 09:28

Replies: 70 Measuring wall shear stress in bend pipe Views: 28,384 Posted By Amir Well, this was a concept we were talking about... Well, this was a concept we were talking about all the time. The viscous term includes both normal and in-plane components, but the pressure term only contains normal component. So if anyone would be...

Forum: OpenFOAM July 16, 2014, 15:51

Replies: 70 Measuring wall shear stress in bend pipe Views: 28,384 Posted By Amir Hi, Reasonably, the total traction force... Hi, Reasonably, the total traction force would be originated from the total stress tensor consisted of both pressure and viscous terms; however, it has a typo and needs to be modified like this: ...

Forum: FLUENT March 17, 2014, 05:00

Replies: 25 particle time step size, number of time steps in DPMPM Views: 19,498 Posted By Amir No! The DPM equations are solved in unsteady... No! The DPM equations are solved in unsteady fashion, but they can be considered in steady or unsteady flow fields. These two are different. Nope. In each numerical analysis, you should assure the...

Forum: FLUENT March 1, 2014, 03:34

Replies: 25 particle time step size, number of time steps in DPMPM Views: 19,498 Posted By Amir I mean the user guide, DPM section. In the manual... I mean the user guide, DPM section. In the manual of FLUENT 6.3, it's sec. 22. Bests,

Forum: FLUENT February 27, 2014, 10:39

Replies: 25 particle time step size, number of time steps in DPMPM Views: 19,498 Posted By Amir Actually, what we need in tracking particles are... Actually, what we need in tracking particles are step size and number of steps. When you're setting the particle time step, the step size is specified and the number of steps would be set by...

Forum: FLUENT January 24, 2014, 14:51

Replies: 25 particle time step size, number of time steps in DPMPM Views: 19,498 Posted By Amir I don't have any idea regarding the evaporating... I don't have any idea regarding the evaporating particles. I guess you need to change the type to droplet not inert. In an unsteady flow, the particles can inject over time with a specified time...

Forum: FLUENT January 24, 2014, 08:51

Replies: 25 particle time step size, number of time steps in DPMPM Views: 19,498 Posted By Amir Hi, Actually these variables are described... Hi, Actually these variables are described in the manual if you can take a look. You can set how the particles are injected in your domain. This happens between "start time" and "stop time"; this...

Forum: Fluent UDF and Scheme Programming January 15, 2014, 16:22

Replies: 13 Using a Plane id in Fluent UDF Views: 8,421 Posted By Amir Dear Negin, First of all, you have to note... Dear Negin, First of all, you have to note that your UDF would need a major revision; it's not just about few typos or commands, there are some conceptual misunderstandings, and, for sure you can...

Forum: Fluent UDF and Scheme Programming January 15, 2014, 04:05

Replies: 13 Using a Plane id in Fluent UDF Views: 8,421 Posted By Amir Dear Negin, This method is useful for some... Dear Negin, This method is useful for some post-processings like reporting an average of a variable over a face, which can be estimated as the average of adjacent cell values; note that we are...

Forum: FLUENT July 30, 2013, 03:41

Replies: 5 same velocity in inlets Views: 1,273 Posted By Amir Hi, There are lots of options. You can... Hi, There are lots of options. You can either use if-clauses to switch between different thread IDs or simply use 3 UDFs. Bests,

Forum: FLUENT July 29, 2013, 15:58

Replies: 5 same velocity in inlets Views: 1,273 Posted By Amir Dear Rayan, Your profile is a function of... Dear Rayan, Your profile is a function of x-coordinate, so you will get different results if the elements of these inlets have different x positions! Did you expect something else?! Bests,

Forum: FLUENT June 27, 2013, 04:58

Replies: 3 Educational versions of Fluent Views: 1,451 Posted By Amir Hi, As I said, I'm not aware of the FSI... Hi, As I said, I'm not aware of the FSI details, but as it's an open source software, it would be possible to correct some aspects and I think it's going on as you can see different sessions in...

Forum: FLUENT June 3, 2013, 09:45

Replies: 37 Moving wall with velocity profile Views: 20,536 Posted By Amir Hi, Refer to the "DEFINE_PROFILE" macro in... Hi, Refer to the "DEFINE_PROFILE" macro in the UDF manual. Bests,

Forum: OpenFOAM April 10, 2013, 17:18

Replies: 70 Measuring wall shear stress in bend pipe Views: 28,384 Posted By Amir Yes, this is correct. It's called the deviation... Yes, this is correct. It's called the deviation tensor because it causes deviation from the isometric pressure tensor. Bests,

Forum: OpenFOAM April 10, 2013, 16:59

Replies: 70 Measuring wall shear stress in bend pipe Views: 28,384 Posted By Amir Yep, something like that. You have to change... Yep, something like that. You have to change it to "(sigma_ij . n).n = 2 * mu * partial(u,x)" No, in your notation it is (sigma.n)! Bests,

Forum: OpenFOAM April 6, 2013, 06:17

Replies: 70 Measuring wall shear stress in bend pipe Views: 28,384 Posted By Amir No, this is not correct! We are talking about... No, this is not correct! We are talking about deviation tensor (T) not the whole stress tensor. The pressure is not a part of deviation tensor. The normal component is originated from the strain rate...

Forum: OpenFOAM April 5, 2013, 15:16

Replies: 70 Measuring wall shear stress in bend pipe Views: 28,384 Posted By Amir If your flow field is turbulent, they shouldn't... If your flow field is turbulent, they shouldn't be the same. It's better to use the same definition for the stress tensor as it's done in the official utility. (It's more general) Bests,

Forum: OpenFOAM April 5, 2013, 13:11

Replies: 70 Measuring wall shear stress in bend pipe Views: 28,384 Posted By Amir The real wall shear stress would be lower since... The real wall shear stress would be lower since it's just one of the component of the wall traction. (The wall traction has 2 perpendicular components, the real wall shear stress and the normal one)...

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