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Forum: Main CFD Forum Today, 11:34

Replies: 8 Asking help on derivation of ALE differential form of momentum conservation equation Views: 174 Posted By FMDenaro Follow carefully the derivation of Chorin Follow carefully the derivation of Chorin

Forum: Main CFD Forum Today, 10:53

Replies: 0 Negative cell volume [Mesh motion] Views: 33 Posted By Fraxiel Negative cell volume [Mesh motion] I'm currently conducting a CFD analysis of a pusher propeller on a medium-sized aircraft. To study the increase of the drag on the entire aircraft (I have done a separate analysis of the aircraft...

Forum: Main CFD Forum Today, 05:23

Replies: 38 DU airfoil Coordinates Views: 23,601 Posted By dmitr Hello, can you please send me to my email... Hello, can you please send me to my email (dima.onega2015@gmail.com) with the coordinates for the profiles du91-w2-250, du 93 w-210 and naca 64-618?

Forum: Main CFD Forum Yesterday, 23:03

Replies: 8 Asking help on derivation of ALE differential form of momentum conservation equation Views: 174 Posted By pfguo Thank you for recommending the book. I've been... Thank you for recommending the book. I've been reading it for a while, but I'm still unclear about where my problem lies. Nevertheless, I sincerely appreciate your attention.

Forum: Main CFD Forum Yesterday, 23:01

Replies: 8 Asking help on derivation of ALE differential form of momentum conservation equation Views: 174 Posted By pfguo Currently, the part where I'm stuck doesn't... Currently, the part where I'm stuck doesn't involve Gauss's theorem, and I don't think my problem lies in the use of Leibniz's theorem either. I strongly feel that I may have misunderstood the...

Forum: Main CFD Forum Yesterday, 18:23

Replies: 0 Using DiPhyx Views: 51 Posted By kate_h Using DiPhyx Hi I just started using DiPhyx (https://diphyx.com) to run an OpenFoam case. I followed their manual in here: ...

Forum: Main CFD Forum Yesterday, 09:55

Replies: 8 Asking help on derivation of ALE differential form of momentum conservation equation Views: 174 Posted By FMDenaro Just follow the idea of the derivation of the... Just follow the idea of the derivation of the Reynolds transport theorem. You can read a rigorous description in the textbook of Chorin & Marsden.

Forum: Main CFD Forum Yesterday, 09:48

Replies: 8 Asking help on derivation of ALE differential form of momentum conservation equation Views: 174 Posted By agd Are you sure you aren't applying Liebniz's... Are you sure you aren't applying Liebniz's theorem twice? Consider mass conservation for a fluid element - mass conservation in a Lagrangian sense is simply the time derivative of the integral of...

Forum: Main CFD Forum Yesterday, 08:15

Replies: 0 frame motion rotational origin Views: 62 Posted By mahir frame motion rotational origin hello everone. i need to ask that i am working on a heat exchanger with an stirrer. i modeled that impeller as frame motion. i am curios about whether i should specify rotational origin as x, y, z...

Forum: Main CFD Forum Yesterday, 07:07

Replies: 0 melting and solidification of phase change materials periodically with time Views: 54 Posted By Sumeet Anand melting and solidification of phase change materials periodically with time Hello everyone, I am simulating the melting and solidification behavior of phase change material (PCM) in the heat pipe for subsequent time cycles. Cold fluid flows in the inner pipe while the PCM...

Forum: Main CFD Forum Yesterday, 04:56

Replies: 8 Asking help on derivation of ALE differential form of momentum conservation equation Views: 174 Posted By pfguo I really appreciate for your attention. ... I really appreciate for your attention. Actually, I got stuck even before applying the divergence theorem to the surface integral term. I got stuck on the term involving the derivative of the...

Forum: Main CFD Forum Yesterday, 04:55

Replies: 0 How to insert tables (P,T) for properties on STARCCM+ Views: 39 Posted By Fluidalessio How to insert tables (P,T) for properties on STARCCM+ Hi guys, I am working with supercritical water and would like to include the pressure and temperature dependency in the properties via the tables that STARCCM+ provides. I have never done this and...

Forum: Main CFD Forum April 29, 2024, 16:52

Replies: 3 Lid-Driven Cavity Fortran Code works for coarse mesh but not fine mesh Views: 69 Posted By FMDenaro This picture means nothing. You need to check at... This picture means nothing. You need to check at the final steady state. Use the quantitative comparison, velocity profiles, vorticity and so on.

Forum: Main CFD Forum April 29, 2024, 16:03

Replies: 3 Lid-Driven Cavity Fortran Code works for coarse mesh but not fine mesh Views: 69 Posted By praveenu Hi, the Re = 100, I've attached the tecplot file... Hi, the Re = 100, I've attached the tecplot file of the last time step.

Forum: Main CFD Forum April 29, 2024, 15:29

Replies: 3 Lid-Driven Cavity Fortran Code works for coarse mesh but not fine mesh Views: 69 Posted By FMDenaro Re number? Solution on the 11x11 grid? Re number? Solution on the 11x11 grid?

Forum: Main CFD Forum April 29, 2024, 14:53

Replies: 8 Asking help on derivation of ALE differential form of momentum conservation equation Views: 174 Posted By agd You will also need to move the temporal... You will also need to move the temporal derivative inside the volume integral, even in the case of deforming boundaries. There is a mathematical theorem to handle that also - I'll leave that as an...

Forum: Main CFD Forum April 29, 2024, 14:50

Replies: 8 Asking help on derivation of ALE differential form of momentum conservation equation Views: 174 Posted By agd Try using Gauss' theorem to convert the area... Try using Gauss' theorem to convert the area integrals to volume integrals. Then you have to make the argument that if the integral equals to zero then under sufficient conditions for continuity of...

Forum: Main CFD Forum April 29, 2024, 14:36

Replies: 12 Y+ vs meshing for very high Reynolds number Views: 174 Posted By cratermons Absolutely possible. We can definitely play... Absolutely possible. We can definitely play around with the melting point depression associated with salt content of the water. But the point is to look at what happens to the water (with some...

Forum: Main CFD Forum April 29, 2024, 14:33

Replies: 12 Y+ vs meshing for very high Reynolds number Views: 174 Posted By JBeilke Are you sure, that the water on these moons has... Are you sure, that the water on these moons has the same properties as our standard-water here on earth. Maybe the moonies put in some salt to delay freezing.

Forum: Main CFD Forum April 29, 2024, 13:59

Replies: 3 Lid-Driven Cavity Fortran Code works for coarse mesh but not fine mesh Views: 69 Posted By praveenu Lid-Driven Cavity Fortran Code works for coarse mesh but not fine mesh Hi all, I've written a FORTRAN code to solve the classical lid driven cavity problem using SMAC algorithm. The time marching is done using first order Euler scheme and spatial discretized using...

Forum: Main CFD Forum April 29, 2024, 13:58

Replies: 12 Y+ vs meshing for very high Reynolds number Views: 174 Posted By cratermons Absolutely. I am currently running a similar... Absolutely. I am currently running a similar simulation for a 20 meter 'pipe'. This is a vertical 'pipe'. In reality, what I am simulating is a dike system where hot water from some deep layer (on...

Forum: Main CFD Forum April 29, 2024, 13:53

Replies: 12 Y+ vs meshing for very high Reynolds number Views: 174 Posted By cratermons This was exactly my thought process. However, it... This was exactly my thought process. However, it was pointed out to me by a colleague at a conference that since I am primarily interested in looking at the heat exchange between the flowing water...

Forum: Main CFD Forum April 29, 2024, 13:49

Replies: 12 Y+ vs meshing for very high Reynolds number Views: 174 Posted By cratermons Interesting. I'll rerun the simulation with the... Interesting. I'll rerun the simulation with the goal of obtaining yplus in this range. Thank you for the tip.

Forum: Main CFD Forum April 29, 2024, 13:47

Replies: 12 Y+ vs meshing for very high Reynolds number Views: 174 Posted By cratermons Thanks for your suggestion. I think moving to LES... Thanks for your suggestion. I think moving to LES is an option, but I feel like it is a whole another beast of its own. If possible, I'd like to get some prelim results from RANS and then proceed. ...

Forum: Main CFD Forum April 29, 2024, 13:43

Replies: 12 Y+ vs meshing for very high Reynolds number Views: 174 Posted By JBeilke When we deal with the flow in geological regions,... When we deal with the flow in geological regions, we should keep in mind, that all boundary values are just guesses. There are usually anomalies in the temperature field. So we should not even...

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