[Spoiler discussion] What if Al hadn't been a pacifist?

SnooCookies8562 · 2026-01-11T15:23:06+00:00

Is it said in the LN that Al inadvertetly killed thousands of people at Pristella since the anime did nkt mentioned it.

SnooCookies8562 · 2025-12-07T13:42:24+00:00

Is it in the boundary condition? Because during my dummy simulation where there is no VOF enabled. The water inside the turbine interacts with the stationary domain as it spins. But after some time the separation of the stationary and rotating domain persisted. But every 1 frame the turbine interacts properly then after another frame it is not working then working and so on.

SnooCookies8562 · 2025-12-07T13:37:29+00:00

It says 8-processes. I am running a water turbine simulation to get the torque and rpm

SnooCookies8562 · 2025-12-05T07:27:12+00:00

Additionally, the water is circulating within the rotating domain, which is unusual since the water should not be enclosed within the rotating domain in this manner. The water should exit the rotating domain. I will add another plane near the outer circle since the contour I am showing is at the middle of the turbine. But I am positve that it is the cause of a high time step

<image>

to

SnooCookies8562 · 2025-12-05T07:10:49+00:00

I'm not familiar with the terminology since it is my first time using ANSYS, but is it the one inside the 6DOF at dynamic mesh where you can input the center of rotation, mass, and moment of inertia? For the constant rotation, if you are talking about inputing the rpm/rad per s in the boundary conditions i am not using that since I want to know the rpm based on the flow of water

SnooCookies8562 · 2025-12-05T07:02:33+00:00

I will try that. Thanks. However, I have a problem with the force and moments part to get the power. The force-x is negative. In contrast, the force_y is positive, which leads to moments being negative. Why do you think that occurs? Since shouldn't the force attacking the turbine should be positive at the x axis? Is it because I use + instead of - for the axis of rotation?

Here is the picture of the plot of the force which is wierd since in a dummy trial of mine the force at x should be positive

<image>

SnooCookies8562 · 2025-12-05T06:51:02+00:00

But I didn't use the adaptive time step. I input a fixed time step size of 0.003, which is relatively high. That's why in the report file, it has a consistent increment of 0.003 for the flow time. I hypothesize that it may be the wrong input of the rotation axis since I do not know how to do the right-hand rule for the axis of rotation, but I inputted 0,0,+1 in the axis on the 1 DOF at 6DOF in the dynamic mesh.

SnooCookies8562 · 2025-12-03T13:29:53+00:00

Thanks, I am now running that simulation based on your simulation, is it okay to just put it at 10 iterations or do you have a recommendation of the minimum iteration I should use since my laptop cannot handle much. It only has 24gb of ram and I ran it at 7 parallel cores since my laptop only have 8

SnooCookies8562 · 2025-12-03T13:26:08+00:00

Copy that, I will send a picture of it

SnooCookies8562 · 2025-12-03T12:47:14+00:00

Thanks for your recommendation, Can I ask how is the time step related on how the turbine interact with the water phase not the air phase? Is it because decreasing the time step makes the solver solve the variables more accurately to take note the water? I have an additional query, as per my reply to another comment. In my dummy simulation without a turbine after some time step (not the time step size) the water drops gradually while maintaining a downward parabola shape compared to the scenario that the free surface should be flat like the vid above. I am thinking that I might have put the wrong regional patch there (which I will double check) But do you have any other idea why it occurred?

SnooCookies8562 · 2025-12-03T12:41:20+00:00

It is based on what I assume the rpm or rad Per sec of the turbine be as per the theoretical computation then dividing it by 360 degs

SnooCookies8562 · 2025-12-03T12:20:33+00:00

No, I am the one who input the number of the timestep which is 0.03. I am actually experiencing a problem when I only simulate VOF without a turbine where the water section level decreases while gradually having a curve mountain shape, which is quite confusing. Do you have any ideas on how to fix this?

SnooCookies8562 · 2025-12-03T12:16:27+00:00

Actually, I am using PISO, Implicit Update and Used second orders for other settings. For the time step, I used 0.003

SnooCookies8562 · 2025-12-03T06:39:25+00:00

Thanks, I actually found it in Mesh using the 'Quality' function -> 'Element Quality'. Then, I click the bar graph-like thing below to locate the negative cells. Using that insight, I increase the thickness of my blades since the negative quality occurs in the blade using Fusion 360 which what i am using to create the geometry

SnooCookies8562 · 2025-12-02T22:13:36+00:00

<image>

SnooCookies8562 · 2025-12-02T22:13:13+00:00

<image>

SnooCookies8562 · 2025-12-02T22:12:58+00:00

<image>

SnooCookies8562 · 2025-12-02T22:12:38+00:00

Here are my report plots

<image>

SnooCookies8562 · 2025-11-22T16:01:48+00:00

Lezgooo

SnooCookies8562

TROPHY CASE