Reply To: coupled simulation of vehicle and fluid tank

[vikram chahal]

#include "udf.h"

DEFINE_SOURCE(moment_source, c, t, dS, eqn)

{

    real time = CURRENT_TIME; // Get the current simulation time

    real moment = 0.0; // Initialize moment to zero

    real CG[ND_ND]; // Center of gravity coordinates

    real cellCG[ND_ND]; // Cell center coordinates

    C_CENTROID(CG, c, t); // Get CG of the domain

    C_CENTROID(cellCG, c, t); // Get cell center coordinates

    real distance_from_CG = cellCG[2] - CG[2]; // Distance along z-axis

    /* Check if time is within the specified duration */

    if (time <= 2.0)

    {

        /* Apply moment only to cells at CG */

        if (distance_from_CG = 0.0)

        {

            moment = 5000.0; // Apply 5000 Nm moment

    }

    dS[eqn] = 0.0; // Reset the source term

    return moment; // Return the moment as the source term

}

and hooked as the souce term of fluid domain under cell conditions.

this UDF is giving very less value of force... could  you please check it whether syntex and logic is correct or not.